What is a computer network? A plain-English start
In short: A network is two or more devices connected so they can share information. Your home Wi-Fi is a small network; the internet is millions of networks connected together.
The simple idea
A computer network is just devices connected so they can talk to each other. When you send a message, stream a video or print from your laptop, information travels across a network in small pieces called packets.
Everyday examples
- Home network: your phone, laptop and smart TV connected to your Wi-Fi router.
- Office network: computers, printers and servers connected through switches.
- The internet: millions of networks around the world connected together.
Types of network by size
| Type | Covers | Example |
|---|---|---|
| PAN (personal area network) | A few metres | Phone connected to wireless earbuds |
| LAN (local area network) | A home, office or building | School or office Wi-Fi and cabled network |
| WAN (wide area network) | Cities or countries | A company linking branch offices |
| The internet | The whole world | Websites, email, cloud apps |
The devices that make it work
- End devices: laptops, phones, printers, cameras. They send and receive data.
- Switch: connects devices inside one network.
- Router: connects different networks together, such as your home and the internet.
- Access point: lets devices join the network without cables (Wi-Fi).
- Cables and radio waves: the "roads" the data travels on.
What makes them understand each other?
Devices follow agreed rules called protocols, like a common language. You'll meet the most important ones in this series: IP for addresses, DNS for names, DHCP for automatic setup, and TCP and UDP for delivery.
Next in the series: IP addresses explained simply.
Real-world example: one evening in a family home
Picture a family of four at home after school. Dad prints a boarding pass from his laptop on the printer in the hallway. Mum casts a recipe video from her phone to the smart TV in the kitchen. One child plays an online game on a console, and the other video-calls a friend. All of these devices are talking at the same time, and every conversation goes through the same small box: the Wi-Fi router.
Notice two kinds of traffic. Printing and casting stay inside the home network: the data never needs to leave the house. The game and the video call go out through the router to the internet and back. That is the difference between a LAN and the wider internet, happening in one living room.
Try this: most home routers have an app or admin page with a "connected devices" list. Open it and count how many devices are on your network right now. Many people are surprised to find doorbells, speakers and watches on the list too.
Key takeaways
- A network is devices connected to share information.
- LAN = local (home or office); WAN = wide area; the internet = networks of networks.
- Switches connect devices; routers connect networks.
- Protocols are the shared rules that let devices understand each other.
Original content written by Mohamed Fayas for FM TecHub. © 2026 FM TecHub. You're welcome to share a link to this page; please don't copy the text elsewhere without permission.