A computer network is a group of computers and other devices (like printers, servers, routers, mobile phones) that are connected together to share information, resources, and services.
In simple words:
When two or more computers are connected to communicate and share data, it is called a computer network.
Simple Real-Life Example
When you connect your:
- Laptop
- Mobile phone
- Smart TV
to the same Wi-Fi, they become part of a small network.
That Wi-Fi connection allows:
- File sharing
- Internet access
- Printing documents
- Streaming videos
Biggest Example of Computer Network
The Internet
The Internet is the largest computer network in the world.
It connects millions of computers globally.
Why Do We Need Computer Networks?
Computer networks help us:
- 📂 Share files (documents, images, videos)
- 🖨️ Share hardware (printers, scanners)
- 🌐 Access the internet
- 📧 Send emails
- 💬 Communicate (WhatsApp, Zoom, etc.)
- ☁️ Use cloud services (Google Drive, AWS)
Basic Components of a Computer Network
- Sender – Device that sends data
- Receiver – Device that receives data
- Transmission Medium – Cable or Wireless (Wi-Fi)
- Protocol – Rules for communication (like TCP/IP)
Types of Computer Networks
| Type | Full Form | Area Covered | Example |
|---|---|---|---|
| LAN | Local Area Network | Small area (home, office) | Office Wi-Fi |
| MAN | Metropolitan Area Network | City level | City broadband network |
| WAN | Wide Area Network | Large area / Country | Internet |
Technical Definition (Interview Style)
A computer network is a collection of interconnected computing devices that communicate and share resources using communication protocols over wired or wireless media.