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Shared search · Sep 20, 2026

how are you?

I’m doing well, thanks for asking! How are you?

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i want to know osi layer operation step by step

OSI model operation step by step

The OSI model has seven layers. On the sender, data moves from Layer 7 down to Layer 1. On the receiver, it moves from Layer 1 back up to Layer 7. Each layer provides services to the layer above it. 13

Example: You open a web page and request data from a web server.

1. Application layer — Layer 7

  • Provides network services directly to applications.
  • Examples: web browsing, email, file transfer.
  • Common protocols: HTTP/HTTPS, DNS, FTP, SMTP.
  • The browser creates the original message, such as an HTTP request.

Data unit: Data

2. Presentation layer — Layer 6

  • Converts data into a format both systems understand.
  • Performs translation, encryption/decryption, and compression.
  • For HTTPS, encryption is commonly associated with this function in the OSI explanation.

Data unit: Data

3. Session layer — Layer 5

  • Establishes, manages, and terminates communication sessions.
  • Controls when a conversation starts and ends.
  • Can help synchronize and recover a long communication session.

Data unit: Data

4. Transport layer — Layer 4

  • Provides end-to-end delivery between applications.
  • Splits large data into smaller pieces called segments.
  • Adds port numbers so the data reaches the correct application.
  • May provide reliability, sequencing, flow control, and error recovery.

Examples:

  • TCP: reliable, connection-oriented delivery.
  • UDP: faster but does not guarantee delivery.

Data unit: Segment for TCP; datagram for UDP

5. Network layer — Layer 3

  • Adds the source and destination IP addresses.
  • Determines the best path through interconnected networks.
  • Routers primarily operate at this layer.

Example protocol: IP

Data unit: Packet

6. Data Link layer — Layer 2

  • Adds local network addresses, usually MAC addresses.
  • Places the packet inside a frame.
  • Performs local error detection.
  • Switches primarily operate at this layer.

Examples: Ethernet and Wi-Fi framing

Data unit: Frame

7. Physical layer — Layer 1

  • Converts the frame into electrical, radio, or light signals.
  • Transmits raw bits—zeros and ones—through a cable, fiber connection, or wireless signal.
  • Hubs, cables, connectors, and radio signals are associated with this layer.

Data unit: Bits

Sender-side process

text
1Application data
2      ↓
3L7: Application   → creates the message
4L6: Presentation  → formats/encrypts/compresses
5L5: Session       → manages the session
6L4: Transport     → adds ports; creates segments
7L3: Network       → adds IP addresses; creates packets
8L2: Data Link     → adds MAC addresses; creates frames
9L1: Physical      → sends bits as signals

This process is called encapsulation: each lower layer adds its own control information, usually in the form of a header. The OSI model describes these seven communication functions from user-facing applications down to physical transmission. 23

Receiver-side process

When the server receives the signals, the process is reversed:

text
1Bits
2 ↓
3L1: Physical      → receives and reconstructs bits
4L2: Data Link     → checks the frame and MAC address
5L3: Network       → checks the IP address and removes the packet header
6L4: Transport     → reassembles data and delivers it to the correct port
7L5: Session       → manages the communication session
8L6: Presentation  → decrypts, decompresses, and translates data
9L7: Application    → gives the message to the server application

This reverse process is called decapsulation. The receiver removes each layer’s header and eventually delivers the original data to the intended application. 34

Simple encapsulation example

text
1Application data
2→ Segment = Transport header + data
3→ Packet  = Network header + segment
4→ Frame   = Data Link header + packet + trailer
5→ Bits    = Frame converted into signals

At the destination:

text
1Bits → Frame → Packet → Segment → Application data

Memory aid

From Layer 7 to Layer 1:

All People Seem To Need Data Processing

  • Application
  • Presentation
  • Session
  • Transport
  • Network
  • Data Link
  • Physical

The OSI model is mainly a learning and troubleshooting framework; modern Internet protocols are commonly described using the TCP/IP model, whose layers do not map perfectly one-to-one to all seven OSI layers. 2

Related

Converts data into a format both systems understand. tell me example

Example: character encoding conversion

Suppose Computer A uses ASCII encoding, but Computer B uses EBCDIC encoding.

  1. Computer A wants to send the word “HELLO.”
  2. It represents each character using ASCII codes.
  3. The Presentation Layer converts the data into a format Computer B understands—EBCDIC.
  4. The data travels across the network.
  5. Computer B receives the EBCDIC data.
  6. Its Presentation Layer converts it into the format used by its application.
  7. The application displays “HELLO” correctly.

This conversion prevents the receiver from seeing unreadable or incorrect characters. ASCII, EBCDIC, and Unicode are examples of character encodings that may require translation between systems. 17

Modern example: UTF-8

A phone sends the message:

text
1こんにちは

The sender encodes the characters using UTF-8. The receiver decodes the UTF-8 data and displays the same Japanese text. Without compatible encoding, the receiver might see:

text
1����

The Presentation Layer is also commonly explained as handling encryption/decryption and compression/decompression, such as encrypting data for HTTPS or decompressing a ZIP file. 13

Related

where all the layers are exists? within cpu?

No. The OSI layers do not all exist inside the CPU. The OSI model is a conceptual framework that describes how networking works across software, operating-system functions, network hardware, and cables. 13

Where each layer exists

OSI layerUsually implemented inExample
7. ApplicationApplications and servicesChrome, email app, web server, DNS software
6. PresentationApplications, libraries, or operating systemEncryption, character encoding, compression
5. SessionApplications and operating-system networking softwareManaging a communication session
4. TransportOperating-system kernel or networking stackTCP and UDP
3. NetworkOperating system and routersIP addressing and routing
2. Data LinkNetwork card/NIC driver and network hardwareEthernet, Wi-Fi, MAC addresses
1. PhysicalNetwork card, Wi-Fi radio, cables, switches, antennasElectrical, radio, or light signals

The OSI model separates network functions into seven layers, but real modern systems often combine some of these functions—especially the Session and Presentation layers—within applications or other networking software. 23

What does the CPU do?

The CPU executes instructions from:

  • Your application
  • The operating system
  • TCP/IP networking software
  • Network-card drivers
  • Encryption and compression libraries

Therefore, the CPU may help process Layers 2–7, but the layers are not physical sections inside the CPU.

For example:

text
1Web browser              → Layer 7
2Operating-system TCP     → Layer 4
3Operating-system IP      → Layer 3
4Network-card driver      → Layer 2
5Network card and cable   → Layers 2 and 1

Some network cards and routers contain specialized processors that handle tasks such as checksums, packet filtering, and encryption, reducing the CPU’s workload.

Example: sending a web request

When you open a website:

  1. Browser creates an HTTP/HTTPS request — Layer 7.
  2. Software formats and encrypts the data — Layer 6.
  3. The operating system manages the connection — Layer 5.
  4. TCP divides the data and adds port numbers — Layer 4.
  5. IP adds source and destination addresses — Layer 3.
  6. The network card adds MAC addresses and creates an Ethernet/Wi-Fi frame — Layer 2.
  7. The network card sends electrical or radio signals — Layer 1.

So, the complete path is:

text
1Application software
2        ↓
3Operating system
4        ↓
5Network-card driver
6        ↓
7Network card
8        ↓
9Wi-Fi/cable/switch/router

Simple answer: the CPU runs much of the networking software, but the OSI layers are distributed across the application, operating system, network card, router, and transmission medium—not located inside the CPU.

Related

it include both software and hardware?

Yes. The OSI model includes both software and hardware, but it is not itself a physical device—it is a conceptual model for describing how network communication works across both. 34

OSI layersMostly implemented byExamples
Layers 7–5: Application, Presentation, SessionSoftwareWeb browser, encryption, data formatting, session management
Layer 4: TransportOperating-system software, sometimes hardware accelerationTCP and UDP
Layer 3: NetworkOperating-system software and routersIP addressing and routing
Layer 2: Data LinkNetwork card, driver, switchMAC addresses and Ethernet/Wi-Fi frames
Layer 1: PhysicalHardware and transmission mediumCable, fiber, radio, electrical signals

For example, when you visit a website:

text
1Browser              → software
2TCP/IP stack         → operating-system software
3Network-card driver  → software
4Network card         → hardware
5Wi-Fi/cable          → physical medium
6Router and switch    → hardware plus software

The boundaries are not strict. Modern network cards, routers, and CPUs can share responsibilities—for example, hardware may perform some encryption or packet processing. Also, the OSI model describes functions, not exactly where every function must be physically located. 14

In short: upper layers are usually software; lower layers involve more hardware, but the OSI model covers the complete communication process.

Related

what is network card and card driver , it is header

A network card and a network-card driver are not headers.

1. Network card (NIC)

A network card, also called a Network Interface Card (NIC) or network adapter, is hardware that connects your computer to a network. It may be:

  • An Ethernet port for a cable
  • A Wi-Fi adapter
  • A built-in chip on a laptop or motherboard
  • An external USB network adapter

The NIC sends and receives electrical, radio, or optical signals. It operates mainly at the Physical and Data Link layers. 16

2. Network-card driver

A network driver is software provided by the operating system or hardware manufacturer. It allows the operating system to communicate with and control the NIC. IBM describes the driver as the software layer between the network software and the physical network adapter. 3

For example:

text
1Application
2     ↓
3Operating-system network stack
4     ↓
5Network-card driver  ← software
6     ↓
7Network card/NIC     ← hardware
8     ↓
9Wi-Fi or Ethernet cable

The driver tells the NIC things such as:

  • Send this data
  • Receive this frame
  • Report an error
  • Use this network speed
  • Provide received data to the operating system

3. What is a header?

A header is a small section of information placed at the beginning of data. It is part of a packet or frame, not a physical device.

Example:

text
1[Ethernet header][IP header][TCP header][Application data]

Typical information includes:

  • Ethernet header: source and destination MAC addresses
  • IP header: source and destination IP addresses
  • TCP header: source and destination port numbers, sequence information
  • Application data: the actual message, webpage request, file, etc.

When sending data, networking software and sometimes the NIC add headers. When receiving data, the headers are read to determine where the data should go. A driver helps transfer these packets between the operating system and the NIC; it is not itself a header. 35

Simple distinction:

text
1Network card  = hardware
2Network driver = software
3Header         = information attached to a packet

Also, “NIC card” is commonly said, but NIC already means Network Interface Card, so “network card” or “NIC” is more precise.

Related

network can be connected both wire and wireless. can you give example

Yes. A network can use wired connections, wireless connections, or both.

Example 1: Wired network

text
1Laptop/PC ── Ethernet cable ── Wi-Fi router ── Internet
  • The computer uses a wired network card/NIC.
  • An Ethernet cable connects it to the router.
  • The data travels through copper or fiber cable.
  • The common protocol is Ethernet. 14

Real-life example: A desktop computer in an office connects to a switch using a CAT6 Ethernet cable.

Example 2: Wireless network

text
1Smartphone ))) Wi-Fi radio waves ((( Wi-Fi router ── Internet
  • The smartphone uses a wireless network card.
  • It communicates with the router through radio waves.
  • No Ethernet cable connects the smartphone to the router.
  • The common technology is Wi-Fi, based on IEEE 802.11 standards. 14

Real-life example: Your phone connects to your home Wi-Fi while you browse the web.

Example 3: Both in the same network

text
1Desktop PC ── Ethernet cable ──┐
2                               ├── Wi-Fi router ── Internet
3Laptop ))) Wi-Fi ))) ──────────┘
4Phone  ))) Wi-Fi ))) ──────────┘

Here:

  • The desktop uses a wired NIC.
  • The laptop and phone use wireless NICs.
  • The router connects all of them.
  • They can share files, printers, and the same Internet connection.

The connection between your device and the router may be wired or wireless, while the router may use another type of connection to reach the Internet. For example, a home router can connect to your desktop by Ethernet, to your phone by Wi-Fi, and to the Internet through fiber or cable. Wired networks use physical cables, while wireless networks use radio waves. 24

text
1Wired NIC       = Ethernet port/cable
2Wireless NIC    = Wi-Fi adapter/antenna
3Network driver  = software that controls either NIC

Related

mobile is connected router via wi fi?

Yes. A mobile phone can connect to a home router through Wi‑Fi.

text
1Mobile phone ))) Wi‑Fi radio waves ((( Wi‑Fi router ── cable/fiber ── Internet
  • The phone’s wireless network card and antenna send and receive radio signals.
  • The router receives the phone’s data and forwards it to the Internet.
  • You usually select the Wi‑Fi name, called the SSID, and enter its password.
  • The phone is connected to the router without an Ethernet cable. Wi‑Fi connects devices to the router, while the router usually receives Internet service through a cable, fiber, or similar connection. 1

However, when Wi‑Fi is turned off or unavailable, the phone can connect directly to a cellular tower using mobile data:

text
1Mobile phone ))) cellular signal ((( Cell tower ── Internet

So:

  • Wi‑Fi: phone → router
  • Mobile data: phone → cell tower
  • Both: provide Internet access, but they use different networks

Related

in order to get wifi, router is must?

Usually, yes—but not always.

To create a Wi‑Fi network, you need a device that broadcasts Wi‑Fi. This is commonly a wireless router, which allows phones, laptops, and other devices to connect wirelessly. 1

Common examples

  • Home Wi‑Fi: Phone → Wi‑Fi router → Internet
  • Mobile hotspot: Phone → hotspot → laptop
  • Office Wi‑Fi: Laptop → wireless access point → network
  • Local Wi‑Fi without Internet: Two phones connect to the same router or hotspot, but there is no Internet connection.

A modem alone usually does not provide Wi‑Fi; it connects your home to the Internet service provider. Many devices combine a modem and router in one box, often called a modem-router or gateway. 27

So the simple answer is:

A router is not absolutely required, but a router, wireless access point, or hotspot device is required to create Wi‑Fi.

Related

mobile can be talked with anoterh mobile using wifi . i can send message from my laptop to mobile phone. these are all need no router?

Yes, devices can communicate using Wi‑Fi without a separate router.

Examples

  • Phone ↔ phone: Use Wi‑Fi Direct. Compatible phones can connect directly and exchange files or messages locally without a router or Internet connection. 16
  • Laptop ↔ phone: Turn on the phone’s mobile hotspot. The phone acts like a small Wi‑Fi access point, so the laptop connects directly to it. No home router is required.
  • Phone ↔ phone through a messaging app:
    • If the app uses the Internet, you need mobile data, a router, or another Internet connection.
    • If it is designed for local Wi‑Fi/peer-to-peer messaging, the phones can communicate without Internet.
  • SMS/text messages: These normally use the cellular network, not Wi‑Fi. Wi‑Fi Calling or RCS may use Wi‑Fi depending on the phone and carrier.

So, a router is not required for every Wi‑Fi connection. A router is needed for normal home Wi‑Fi, but Wi‑Fi Direct or a phone hotspot can connect devices directly. 45

Related

for ethernet cable wifi is must

No. Ethernet cable does not require Wi‑Fi.

Ethernet and Wi‑Fi are two different ways to connect:

  • Ethernet: wired connection using a network cable.
  • Wi‑Fi: wireless connection using radio signals. 2

For example:

  • Laptop → Ethernet cable → router: works without the laptop using Wi‑Fi.
  • Laptop → Ethernet cable → another computer: can communicate locally without Wi‑Fi or Internet, if the network is configured.
  • Laptop → Ethernet cable → modem/router: can provide Internet through the cable.

You need a router or network switch only if you want to connect several wired devices together. You need an Internet service/modem if you want Internet access; Wi‑Fi itself is not required. Ethernet is generally a separate wired networking method and can work without a Wi‑Fi adapter. 36

Related

why ethernet cable is needed to communicate two computers?

An Ethernet cable is not always needed. Two computers need some communication path between them:

  • Wi‑Fi: both computers connect to the same Wi‑Fi network.
  • Ethernet cable: connects the computers directly.
  • Router or switch: connects both computers using separate Ethernet cables.
  • USB/Bluetooth: possible for some types of communication.

You use an Ethernet cable when you want a wired connection—for example, faster transfer, lower delay, or when Wi‑Fi is unavailable. A direct Ethernet connection can work without a router, switch, Wi‑Fi, or Internet. Modern computers usually work with a normal Ethernet cable; older equipment may require a crossover cable. 168

For a direct connection, the computers may automatically assign addresses, or you may need to set them manually, such as:

  • Computer A: 192.168.1.1
  • Computer B: 192.168.1.2
  • Subnet mask on both: 255.255.255.0

Then applications can communicate using those local IP addresses. Internet access is not required. 1

Related

same wifi network between two computers radiowaves is generated and go?

Yes, exactly. Wi‑Fi uses radio waves to send data through the air.

Typical communication works like this:

  1. Computer A converts data—such as a file or message—into digital signals.
  2. Its Wi‑Fi adapter uses an antenna to convert those signals into radio waves.
  3. The radio waves travel through the air to the Wi‑Fi router/access point.
  4. The router sends the data by radio waves to Computer B.
  5. Computer B’s Wi‑Fi adapter converts the radio signal back into computer data.

So the path is usually:

Computer A ⇄ radio waves ⇄ Wi‑Fi router ⇄ radio waves ⇄ Computer B

The computers generally do not need to send directly to each other; the router coordinates the communication. Wi‑Fi commonly uses the 2.4 GHz, 5 GHz, or 6 GHz bands, and the data is encoded by carefully changing properties of the radio signal. 134

Internet access is not necessary: if both computers are connected to the same local Wi‑Fi network, they can share files or communicate locally.[]{related}
How does a Wi‑Fi router send data to the correct computer?
Can two computers connect directly without a router?
What is the difference between Wi‑Fi and mobile data?

Related

then how this radiowave is generated within a computer?

Inside the computer, a Wi‑Fi adapter creates the radio signal. It contains several important parts:

  1. Computer data becomes bits
    For example, a file is represented as 0s and 1s.

  2. The Wi‑Fi chip creates a very fast alternating electrical signal
    An electronic oscillator produces a signal at a Wi‑Fi frequency, such as approximately 2.4 GHz or 5 GHz.

  3. The bits modify that signal
    The chip changes properties of the signal—such as its phase or amplitude—to encode the data. This is called modulation.

  4. The signal flows into the antenna
    The rapidly changing electrical current in the antenna creates changing electric and magnetic fields. Those fields detach from the antenna and travel outward as an electromagnetic wave, or radio wave. 3

  5. The receiving computer reverses the process
    Its antenna receives the tiny radio signal and converts it back into an electrical signal. The Wi‑Fi chip then demodulates it and reconstructs the original bits. 5

A simplified path is:

Data → Wi‑Fi chip → rapidly changing current → antenna → radio wave

The antenna itself usually does not create the data; it converts electrical signals into radio waves when transmitting, and radio waves back into electrical signals when receiving. 5

Related

digital signal is converted into radiowaves here?

Yes—but more precisely, the digital data is used to modify a radio-frequency signal.

The process is:

Digital bits → Wi‑Fi chip → modulated electrical signal → antenna → radio wave

  1. The computer has data represented as bits (0 and 1).
  2. The Wi‑Fi chip generates a steady high-frequency electrical “carrier” signal, such as around 2.4 GHz or 5 GHz.
  3. It modulates that carrier by changing its phase, amplitude, or frequency according to the bits. 2
  4. This changing electrical current reaches the antenna.
  5. The antenna converts the changing current into an electromagnetic radio wave sent through the air. 1

So it is not quite that the computer turns a 0 directly into one radio wave and a 1 into another. Instead, the Wi‑Fi electronics encode many bits by making carefully controlled changes to a high-frequency carrier wave.

At the receiving computer, the reverse occurs:

Radio wave → antenna → electrical signal → Wi‑Fi chip → digital bits

The antenna can convert electrical signals into radio waves for transmission, and radio waves back into electrical signals for reception. 1

Related

wifi is a chip inside cpu?

Usually, no—the Wi‑Fi chip is not inside the CPU.

A computer normally has:

  • CPU: runs programs and processes data.
  • Wi‑Fi adapter/chip: handles wireless communication.
  • Antenna: sends and receives radio waves.

The Wi‑Fi adapter may be:

  • A small M.2 card inside a laptop
  • Built directly onto the motherboard
  • A USB Wi‑Fi adapter
  • Partly integrated into a larger chipset or system-on-chip

The CPU communicates with the Wi‑Fi chip through the computer’s internal connections, then the Wi‑Fi chip handles modulation, radio frequencies, and the antenna.

Some specialized processors or system-on-chip designs can include Wi‑Fi circuitry, but this is different from saying that ordinary desktop or laptop CPUs contain Wi‑Fi. Intel has demonstrated processors with integrated Wi‑Fi transceivers, for example. 1

A simple layout is:

CPU ↔ Wi‑Fi chip ↔ antenna ↔ radio waves

Related

wifi adapter is a physicael hardware?

Yes. A Wi‑Fi adapter is physical hardware that lets a device connect to a Wi‑Fi network. It sends and receives data using radio signals. 1

It can be:

  • Built in to a laptop, phone, or motherboard
  • A removable USB Wi‑Fi dongle
  • An internal PCIe card in a desktop computer
  • A small internal M.2 card in many laptops

It also needs software drivers so the operating system can communicate with it, but the adapter itself is a physical electronic component. 5

Simple analogy: the Wi‑Fi adapter is like a translator between the computer’s digital data and radio waves.

Related

then what is wifi is given by airtel network . what does it indicate . they are not using any wifi dongle and any phsical hardward. i am seeing only router only

The router itself contains physical Wi‑Fi hardware—you do not need a separate Wi‑Fi dongle.

In an Airtel home setup, the router usually combines several components:

  1. Modem/ONT: receives internet from Airtel, often through a fiber-optic cable.
  2. Router: shares that internet connection among your devices.
  3. Wi‑Fi access point: contains a Wi‑Fi radio chip and antennas, broadcasting the network name you see.

So the arrangement is:

Airtel fiber/connection → Airtel router’s internal hardware → Wi‑Fi radio signal → phone/laptop

Your phone, laptop, or smart TV also has its own built-in Wi‑Fi adapter, usually hidden inside the device. That is why you do not see a dongle. Airtel’s fiber equipment commonly includes a dual-band ONT/router, while Airtel AirFiber equipment has built-in Wi‑Fi technology as well. 15

A Wi‑Fi dongle is only needed when a device does not already have built-in Wi‑Fi—for example, some desktop computers.

Also, Wi‑Fi and internet are different:

  • Wi‑Fi: wireless connection between your device and the router
  • Internet: connection supplied by Airtel to the router

You can be connected to the router’s Wi‑Fi even if Airtel’s internet connection is temporarily unavailable. Airtel also notes that if other devices can detect the Wi‑Fi but one device cannot, the issue may be that device’s Wi‑Fi adapter. 3

Related

computer genrate radio waves it strikes the router wirelessly?

Yes—your computer and router communicate using radio waves through the air.

What happens

  1. You open a website on your computer.
  2. The computer’s built-in Wi‑Fi adapter converts the digital data into a radio signal.
  3. Its hidden antenna transmits that signal to the router.
  4. The router receives and decodes it, then sends the request to Airtel through the cable or fiber connection.
  5. The website’s response comes back to the router.
  6. The router converts it into radio signals and sends it back to your computer. 1

So it is two-way communication, not merely the computer’s signal “striking” the router:

Computer ⇄ radio waves ⇄ router ⇄ Airtel network

Wi‑Fi commonly uses radio frequencies such as 2.4 GHz and 5 GHz. 1 The router also has internal radio hardware and antennas, even though you may only see the outer box. Your computer’s antenna may be hidden inside the laptop or built into its Wi‑Fi card.

Related

router and computer can be connected wirelessly?

Yes. A computer and a router can connect wirelessly through Wi‑Fi, without an Ethernet cable. Wi‑Fi uses radio waves to exchange information between the computer and router. 13

Two-way communication:

Computer ⇄ radio waves ⇄ router ⇄ Airtel network

  • The computer’s built-in Wi‑Fi adapter and antenna send data to the router.
  • The router receives and decodes it.
  • The router sends the data to Airtel through its fiber or other wired connection.
  • The reply returns wirelessly from the router to the computer. 2

To connect, open your computer’s Wi‑Fi settings, choose the Airtel router’s network name (SSID), and enter the Wi‑Fi password. If the computer has no built-in Wi‑Fi, you need either an Ethernet cable or a USB Wi‑Fi dongle.

Related

wi fi is the technology?

Yes. Wi‑Fi is a wireless networking technology that connects devices—such as computers, phones, and printers—to a router using radio waves. 3

In simple terms:

  • Wi‑Fi = the technology and communication method
  • Router = the device that provides the Wi‑Fi network
  • Radio waves = the signals carrying the data
  • SSID = the Wi‑Fi network’s name
  • Password = the security key used to connect

So the connection is:

Computer ⇄ Wi‑Fi radio waves ⇄ Router

Wi‑Fi is based on technical standards called IEEE 802.11 and commonly uses the 2.4 GHz, 5 GHz, and newer 6 GHz bands. 1

Related

wifi is a software?

No. Wi‑Fi is not software; it is a wireless networking technology/standard that uses radio waves to connect devices. 1

Wi‑Fi requires both:

  • Hardware: a Wi‑Fi chip, radio, and antenna in your computer and router
  • Software: drivers and operating-system settings that control the Wi‑Fi hardware

So, Wi‑Fi itself is the technology, while the Wi‑Fi adapter is hardware and its driver is software.

Related

What is the difference between Wi‑Fi and the internet?

Wi‑Fi and the internet are different:

  • Wi‑Fi is the wireless connection between your device and a nearby router.
  • The internet is the global network of websites, services, computers, and data.

Think of it this way:

Phone → Wi‑Fi → Router → Internet

You can have Wi‑Fi without internet—for example, your phone may connect to the router, but the router’s internet service may be disconnected. You can also use the internet without Wi‑Fi, such as through a mobile-data connection or an Ethernet cable. 13

Related

there is no relation between internet and wifi?

There is a relationship between them, but they are not the same thing.

  • Wi‑Fi connects your device wirelessly to a nearby router.
  • The internet is the worldwide network that lets you access websites, apps, videos, and online services.
  • Your router usually connects to the internet through a cable, fiber line, or another service, then shares that connection with your devices through Wi‑Fi. 15

Example:

Laptop → Wi‑Fi → Router → Internet

So, Wi‑Fi is one way to reach the internet. You can have:

  • Wi‑Fi but no internet: connected to the router, but the internet service is down.
  • Internet without Wi‑Fi: connected using Ethernet cable or mobile data. 34

Related

if internet exists then only wifi technology is used?

No. The existence of the internet does not mean Wi‑Fi must be used.

The internet can reach your device through several technologies:

  • Wi‑Fi: wireless connection from your device to a router
  • Ethernet: wired connection from your device to a router
  • Mobile data: 4G or 5G connection directly from your phone to a cellular network
  • Fiber, cable, DSL, or satellite: technologies that deliver internet service to a home or business

Wi‑Fi is only one local access method. For example:

  • Laptop → Wi‑Fi → Router → Fiber connection → Internet
  • Desktop computer → Ethernet cable → Router → Internet
  • Phone → 5G cellular network → Internet

Wi‑Fi can also work without internet—for example, to connect devices to each other on a local network. 134

Related

without wifi can i get internet. i.e can i access the website?

Yes, you can access websites without using Wi‑Fi, as long as your device has another internet connection.

Examples:

  • Ethernet cable: Computer → Ethernet cable → router → internet 1
  • Mobile data: Phone → 4G/5G network → internet
  • USB tethering: Connect your phone to a computer with a USB cable and share the phone’s mobile data.
  • Satellite or other wired connections: These can also provide internet without Wi‑Fi.

So, open a browser and visit a website using Ethernet or mobile data. However, if you have no Wi‑Fi, no cable, no mobile data, and no other connection, you cannot access a live website; only previously cached or downloaded content may work offline.

Related

so if i connect enternet cable no need to have wifi. yes in our mobile i am using mobile data by switch off wifi

Yes, exactly.

  • If you connect your computer to an internet-connected router or modem using an Ethernet cable, you do not need Wi‑Fi. You can turn Wi‑Fi off and still browse websites through the wired connection. 4
  • On your mobile phone, when you turn Wi‑Fi off and use mobile data, you are accessing the internet through your mobile network (4G/5G), not through Wi‑Fi.

The important distinction is:

  • Ethernet cable: wired internet connection
  • Wi‑Fi: wireless connection from a router
  • Mobile data: wireless connection from a cellular tower

In every case, your internet service must be active. An Ethernet cable connected only to a router with no internet service will provide a local network but may not open websites.

Related

then how can i access this internet. tell one simple example

One simple example

  1. Make sure your home router has internet from your internet provider.
  2. Plug one end of an Ethernet cable into a LAN port on the router.
  3. Plug the other end into your computer’s Ethernet port.
  4. Turn off the computer’s Wi‑Fi.
  5. Open Chrome or another browser and visit a website, such as google.com.

Your computer should use the Ethernet cable automatically; no Wi‑Fi is needed. The router itself must be connected to an active internet service. 15

Example:
Internet provider → router → Ethernet cable → computer → website

If your laptop has no Ethernet port, use a USB-to-Ethernet adapter. 3

Related

who is the internet service provider

An internet service provider (ISP) is the company you pay to give you internet access. Examples include Airtel, Jio, BSNL, ACT, Comcast, Verizon, AT&T, depending on your country. 24

Simple example:

Jio/Airtel internet service → home router → Ethernet cable → computer

  • If you have home broadband, your ISP is the company shown on your internet bill or router connection.
  • If you use mobile data, your ISP is your mobile network company—the provider of your SIM card, such as Jio or Airtel.

To find your home ISP, check your monthly bill, the router/modem label, or ask the person who installed your internet. 4

Related

who is the internet service provider? airtel or cherrinet or fibernet

Airtel, Cherrinet, and Fibernet can all be internet service providers—they are company or service names that can provide your internet connection.

  • If you pay an Airtel Xstream Fiber bill, your ISP is Airtel.
  • If you pay a Cherrinet bill, your ISP is Cherrinet.
  • If you mean ACT Fibernet, your ISP is ACT; “Fibernet” describes the fiber-broadband service.
  • If you mean Airtel Fibernet, your ISP is Airtel.

Simple way to know: check the name on your internet bill, payment app, router sticker, or installation receipt. The company you pay is usually your ISP. Airtel and Cherrinet are both described as broadband/ISP providers in Chennai-related results 13.

Related

can i have wifi in my computer apart from ethernet cable ?

Yes. You can connect your computer to Wi‑Fi without an Ethernet cable.

  • Laptop: Wi‑Fi is usually built in. Click the network/Wi‑Fi icon on the taskbar, select your home Wi‑Fi name, and enter the password.
  • Desktop PC: Check whether it has built-in Wi‑Fi. If not, buy a USB Wi‑Fi adapter—plug it into a USB port, install its driver if required, then connect to your Wi‑Fi network. 1
  • Temporary option: Use your phone’s mobile hotspot or USB tethering. 2

Your Airtel, Cherrinet, or other router must be switched on and broadcasting Wi‑Fi. If no Wi‑Fi networks appear on your computer, it probably needs a Wi‑Fi adapter or its Wi‑Fi is turned off.

Related

in my laptop built in wifi is there. that's why wifi symbol is visible

Yes—your laptop has built-in Wi‑Fi, and the visible Wi‑Fi symbol means the wireless adapter is available.

To connect:

  1. Make sure your Airtel/Cherrinet/Fibernet router is switched on.
  2. Click the Wi‑Fi/network symbol on the taskbar.
  3. Turn Wi‑Fi On, if necessary.
  4. Select your home Wi‑Fi name (SSID).
  5. Click Connect and enter the Wi‑Fi password.
  6. The symbol should show that you are connected. These are also Microsoft’s recommended Windows steps 1.

You do not need an Ethernet cable for the laptop. The Ethernet cable is only needed to connect the internet line/modem to the router, or when setting up/troubleshooting the router.

If you don’t see your Wi‑Fi name, click refresh/scan, move closer to the router, and check that the router’s Wi‑Fi light is on.

Related

how can i turn on wifi in my computer. which one is activated here

If you are using Windows, turn on Wi‑Fi like this:

  1. Click the network icon near the clock on the bottom-right of the screen.
  2. Click the Wi‑Fi button so it becomes highlighted/on.
  3. Select your home Wi‑Fi name.
  4. Click Connect and enter the password.

You can also use:

Start → Settings → Network & internet → Wi‑Fi → On 4

Which connection is activated?

  • Wi‑Fi symbol with curved lines: Wi‑Fi is connected or available.
  • Globe symbol: Wi‑Fi is not connected.
  • Computer/monitor or Ethernet symbol: Internet is connected through an Ethernet cable.
  • Airplane symbol: Airplane mode is on; turn it off first.

To check the actual adapter:

Right-click Start → Device Manager → Network adapters

Look for an item containing Wi‑Fi, Wireless, WLAN, Intel, Realtek, or Broadcom. Right-click it—if you see Disable device, Wi‑Fi is already enabled. If you see Enable device, click it to turn Wi‑Fi on. 4

I cannot see which symbol is activated on your laptop unless you send a screenshot of the bottom-right network menu.

Related

for wifi router must be there?

Yes, you need a Wi‑Fi router or a modem/router combination to use Wi‑Fi internet on your laptop.

  • The router creates the wireless network that your laptop connects to.
  • Your internet provider’s cable/fiber usually connects to the router.
  • A laptop’s built-in Wi‑Fi only receives Wi‑Fi; it does not create home Wi‑Fi by itself.
  • You can use your phone’s mobile hotspot instead of a home router.
  • You can also connect the laptop directly with an Ethernet cable if your provider’s modem supports it, but this will be wired, not Wi‑Fi. 4

Many internet providers supply one box that works as both a modem and Wi‑Fi router. Look for a device with power lights and a Wi‑Fi name/password label.

Related

phone mobile router instead of home router. but wifi must?

Yes—your computer’s Wi‑Fi must be turned on if you want to connect it to your phone’s hotspot.

You do not need a separate home Wi‑Fi router:

  1. On your phone, turn on Mobile data.
  2. Open Settings → Hotspot / Personal Hotspot.
  3. Turn on Mobile Hotspot and note the network name and password.
  4. On the computer, turn on Wi‑Fi.
  5. Select your phone’s hotspot name and enter the password.

The phone uses the mobile network for internet and shares it with the computer through Wi‑Fi 4. Check your phone plan because hotspot data may be limited, and it can use your phone’s battery quickly 4.

You can also connect without Wi‑Fi by using USB tethering: connect the phone to the computer with a USB cable, then enable USB tethering in the phone’s settings.

Related

what is the job of mobile hotspot?

A mobile hotspot lets your phone act like a small Wi‑Fi router.

Its job is to:

  1. Use your phone’s mobile data from the SIM card.
  2. Create a temporary Wi‑Fi network.
  3. Share the internet with your laptop, tablet, or another phone. 1

So:

Mobile network → your phone’s hotspot → Wi‑Fi → laptop

You do not need a home router. However, your laptop must have Wi‑Fi turned on to connect wirelessly. Hotspot use can consume mobile-data allowance and phone battery quickly. 2

Related

instead of using wifi can i use my mobile date and hotspot?

Yes. You can use your phone’s mobile data instead of home internet.

There are two ways:

  • Wi‑Fi hotspot: Your phone uses mobile data and shares it through a Wi‑Fi network. Your laptop must connect using Wi‑Fi.
  • USB tethering: Your phone uses mobile data and shares it through a USB cable, so you do not need Wi‑Fi.
  • Bluetooth tethering: Possible, but usually slower.

A hotspot acts like a portable router and uses your cellular data connection 5. Check your mobile plan’s hotspot limit, because speed may be reduced or data may run out; performance also depends on your signal strength and plan 3. It can also drain your phone battery quickly 4.

Related

how hotspot receives signal

A mobile hotspot receives its internet signal from a nearby mobile/cell tower, not from your home Wi‑Fi.

The process is:

  1. Your phone’s antenna connects to the carrier’s 4G LTE or 5G network.
  2. The phone receives internet data through that cellular connection.
  3. The hotspot feature creates a small Wi‑Fi network.
  4. Your laptop or other device connects to the phone’s Wi‑Fi and uses that mobile data. 12

Example:

Cell tower → mobile data → your phone → Wi‑Fi hotspot → laptop

The hotspot’s speed depends on your mobile signal, location, network congestion, and whether you have 4G or 5G. 5 You can also share the connection through USB tethering, which does not require Wi‑Fi.

Related

how our mobile data is activated first?

Your mobile data is activated by your mobile network provider when you have:

  • An active SIM or eSIM
  • A mobile plan with internet data
  • A working cellular signal

To turn it on:

Android

  1. Open Settings.
  2. Tap Network & internet, Connections, or Mobile network.
  3. Turn on Mobile data.
    You can also swipe down from the top and tap Mobile data.

iPhone

  1. Open Settings.
  2. Tap Cellular or Mobile Data.
  3. Turn on Cellular Data.

Test it by turning off Wi‑Fi and opening a website. If it loads, your mobile data is active.

Then enable the hotspot:

  • Android: Settings → Network/Connections → Hotspot & tethering/Mobile Hotspot → turn it on 12
  • iPhone: Settings → Personal Hotspot → turn on Allow Others to Join 78

Your carrier must support hotspot use on your plan; some plans limit or charge for hotspot data 35. Also, “mobile data” is the correct term—not “mobile date.”

Related

i am haivng BSNL rechaged one. that is responsible for my mobile data

Yes. Your BSNL recharge/plan is responsible for providing mobile data, while your phone’s Mobile Data switch only turns that service on or off.

For BSNL mobile data to work, you need:

  1. An active BSNL SIM and recharge validity.
  2. A recharge plan that includes internet data—a talk-time-only recharge may not provide data.
  3. Mobile Data enabled in your phone settings.
  4. BSNL network coverage in your location.

You can check your BSNL plan and balance by dialing *124#; plan validity can also be checked with *123*1# or *124*1#. 5 You can also view details in the BSNL Selfcare app. 6

So the sequence is:

BSNL recharge plan → BSNL network authorizes data → phone Mobile Data setting uses it → internet works

If your recharge includes data but it still does not work, restart the phone, confirm that BSNL is selected for mobile data if you use two SIMs, and check the APN/network settings. The exact data allowance and validity depend on the recharge plan, so check the confirmation SMS or BSNL Selfcare app. 14

Related

how signl goes from mobile data to hot spot?

Your phone does not convert the mobile signal directly into another mobile signal. It works like this:

BSNL tower → your phone’s mobile data → phone’s Wi‑Fi hotspot → another device

Your phone acts as a small router:

  1. The BSNL SIM connects to a nearby BSNL tower.
  2. BSNL sends internet data to your phone through the cellular network.
  3. When you enable Hotspot, your phone creates a Wi‑Fi network.
  4. Another phone, laptop, or TV connects to that Wi‑Fi network.
  5. Your phone forwards the internet through your BSNL data connection.

How to enable it

Android

Go to:

Settings → Network & Internet/Connections → Hotspot & tethering → Wi‑Fi Hotspot → On

Set a hotspot name and password, then connect your other device to it.

iPhone

Go to:

Settings → Personal Hotspot → Allow Others to Join

Then use the displayed Wi‑Fi password on the other device.

You must keep Mobile Data turned on. Hotspot data will be deducted from your BSNL data allowance. If BSNL hotspot does not work, the phone may need the correct APN settings, especially on some iPhones 16. Hotspot speed also depends on BSNL signal strength and network congestion.

Related

BSNL tower → your phone’s mobile data → phone’s Wi‑Fi hotspot → another device. i am using my mobile data. what is the need of wifi here?

You are right: your own phone does not need Wi‑Fi to use BSNL mobile data.

The word “Wi‑Fi hotspot” refers only to the connection between your phone and the other device:

  • Your phone: receives internet through BSNL’s mobile network.
  • Hotspot: shares that internet with another device using Wi‑Fi.
  • Other device: connects to your phone’s Wi‑Fi name and password.

So:

  • Using internet on your phone: BSNL mobile data only; Wi‑Fi can be off.
  • Sharing internet with a laptop/another phone: BSNL mobile data + your phone’s hotspot Wi‑Fi.
  • No other device to connect? You do not need to turn on hotspot.

Wi‑Fi is simply the short-range wireless “cable” between your phone and the second device; the internet itself still comes from BSNL mobile data. 1

Related

why i go for hotspot, in order to connect my mobile to desktop computer?correct?

Correct. If your desktop computer needs internet from your phone’s BSNL mobile data, you need to share/tether the connection.

You have three options:

  1. Wi‑Fi hotspot — turn on hotspot on the phone, then connect the desktop to your phone’s Wi‑Fi network.
  2. USB tethering — connect the phone to the desktop with a USB cable, then enable USB tethering. This is usually more stable and also charges the phone.
  3. Bluetooth tethering — works wirelessly but is generally slower.

“Hotspot” is the general idea of sharing your phone’s mobile internet; it does not always mean Wi‑Fi specifically. Tethering can use Wi‑Fi, USB, or Bluetooth. 2

For a desktop, if it has no Wi‑Fi adapter, use USB tethering or install a Wi‑Fi adapter.

Related

to get internet in my desktop computer , i have to use my mobile data and hotspot in my mobile?

Yes—if your desktop has no separate internet connection.

You need:

  1. Mobile data ON on your phone — this receives internet from BSNL.
  2. A sharing method to connect the desktop to the phone:
    • Wi‑Fi hotspot: turn on your phone’s hotspot and connect the desktop to it.
    • USB tethering: connect the phone by USB cable and enable USB tethering.
    • Bluetooth tethering: another, slower option.

A phone hotspot shares cellular data with computers and other devices by creating a local Wi‑Fi network. 1 You do not need to connect the phone itself to Wi‑Fi.

Best choice for a desktop: USB tethering, if available—it is generally more stable and avoids needing a Wi‑Fi adapter. If you use a Wi‑Fi hotspot, the desktop must have Wi‑Fi capability; otherwise use USB tethering or add a USB Wi‑Fi adapter. Your BSNL data allowance will be consumed either way. 1

Related

can i use usb cable to connect my mobile and desktop to use hotspot

Yes. You can connect your mobile phone to the desktop with a USB cable and use USB tethering to provide internet. USB tethering is often more stable than a Wi‑Fi hotspot. 14

Steps on an Android phone

  1. Turn on Mobile data.
  2. Connect the phone to the desktop using a data-capable USB cable.
  3. Open Settings on your phone.
  4. Go to Hotspot & tethering or Mobile Hotspot and Tethering.
  5. Turn on USB tethering. The exact menu name may vary by phone. 1
  6. Your computer should recognize the phone as a wired Ethernet internet connection. 1

You usually do not need to turn on Wi‑Fi hotspot when using USB tethering. The phone’s mobile data must be on, and your BSNL data allowance will be used. If the option is unavailable, try another USB cable—some cables are for charging only. 3

Related

can i use wirelessly . is it possible without wifi. only i am having mobile data and hot spot?

Yes, but your desktop needs a wireless receiver.

Option 1: Wi‑Fi hotspot

Your phone uses mobile data and creates a Wi‑Fi hotspot. The desktop connects to it wirelessly. Android supports sharing mobile data with a computer through tethering/hotspot. 7

  • If your desktop has built-in Wi‑Fi, connect normally.
  • If it does not, buy a small USB Wi‑Fi adapter. Without Wi‑Fi capability, it cannot detect the phone’s hotspot.

Option 2: Bluetooth tethering

You may connect wirelessly using Bluetooth tethering, but both the phone and desktop must have Bluetooth. It is usually slower than Wi‑Fi hotspot. 2

Important

You do not need home broadband or a separate Wi‑Fi internet connection. Your phone’s mobile data is the internet source; “Wi‑Fi hotspot” is only the wireless method used to send it to the desktop.

If your desktop has neither Wi‑Fi nor Bluetooth, use USB tethering.

Related

if i want to connect wirelessly i need wifi?

Yes—if you want to connect wirelessly using your phone’s hotspot, your desktop needs Wi‑Fi capability. The phone provides the internet through mobile data and broadcasts a Wi‑Fi network; it does not require home Wi‑Fi. 26

  • Desktop has built-in Wi‑Fi: Turn on your phone’s hotspot, then select it from the desktop’s Wi‑Fi list and enter the password.
  • Desktop has no Wi‑Fi: Add a small USB Wi‑Fi adapter. Without one, the desktop cannot connect to the phone’s Wi‑Fi hotspot.
  • Alternative: Use Bluetooth tethering if both devices support Bluetooth, or use a USB cable. Bluetooth tethering is generally slower than Wi‑Fi. 2

So, you need Wi‑Fi on the desktop, but you do not need a separate Wi‑Fi internet connection—your phone’s mobile data is enough.

Related

yes in my desktop wifi connection is there. without internet can i connect my moble and desktop

Sources8
r/pcmasterrace on Reddit: Is it possible to use a personal hotspot from my phone to get internet to my pc that doesn’t have a WiFi card? My internet is down for an unknown amount of time =(reddit1Turn on mobile hotspot WITHOUT ANY internet to start a PURE local hotspotmicrosoft2How to connect my Android phone to a PC via a WiFi hotspot without a USB - Quoraquora3windows - How can I connect a desktop without wireless to the Internet with a smartphone? - Super Usersuperuser4How to Connect Hotspot to PC via Wi-Fi, USB, or Bluetoothlifewire5How to use my phone's hotspot with a PC that has no wireless connection - Quoraquora6How to Use Your Phone as a Hotspot for Your Laptop (Even Without Wi-Fi) | by Flowsdigital | Mediummedium7Use your Windows device as a mobile hotspot | Microsoft Supportmicrosoft8

Yes. You can connect your mobile and desktop wirelessly without internet.

How

  1. On your phone, turn on Personal Hotspot / Mobile Hotspot.
  2. You may turn mobile data off if you only want a local connection.
  3. On the desktop, click the Wi‑Fi icon.
  4. Select your phone’s hotspot name and enter the password.

This creates a local Wi‑Fi network between the phone and desktop. You can use it for local activities such as file sharing or controlling devices, but websites and online apps will not work without mobile data or another internet connection. A hotspot can function as a local network even when it has no internet connection, depending on the phone and operating system. 2

If your phone refuses to enable the hotspot with mobile data off, turn mobile data on temporarily; you do not necessarily need an active internet connection or data balance.

Related

How can I share files between my phone and desktop without internet?

You can share files without internet by creating a local connection between your phone and desktop.

Easiest wireless method: phone hotspot + local file-sharing app

Android phone

  1. Turn on Mobile Hotspot on your phone. Mobile data does not need to be available.
  2. Connect your desktop to the phone’s hotspot Wi‑Fi.
  3. Install an offline file-sharing app such as PlainApp on your Android phone. It can transfer files over the local hotspot without internet. 5
  4. Open PlainApp and tap Start.
  5. The app will show an address similar to: https://192.168.43.1:8443
  6. Type that address into Chrome or Edge on your desktop.
  7. Accept the security warning if shown, then upload or download files.

Both devices only need to be connected to the same local Wi‑Fi network; internet access is not required. 5

iPhone

Use a local file-transfer app that provides a browser address, such as LocalSend or another offline Wi‑Fi sharing app:

  1. Turn on Personal Hotspot or connect both devices to the same Wi‑Fi network.
  2. Install the same app on the iPhone and desktop.
  3. Open the app on both devices.
  4. Select the desktop, choose the files, and accept the transfer.

Other options

  • USB cable: Usually the simplest and most reliable. Android can use File Transfer/MTP; iPhone can use the Windows Photos app or Apple Devices app.
  • Windows Phone Link: For Windows 11 and Android 10 or later, Phone Link can transfer files between the PC and phone, though it generally needs to be set up first. 1
  • Bluetooth: Works without internet, but is much slower for large videos or many photos.

If the hotspot does not appear on the desktop, turn on Wi‑Fi and Bluetooth on the phone, keep the hotspot screen open, and reconnect the desktop.

Related

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