What is a network?

## What is a network? A **computer network** is two or more devices connected so they can share information. Your Wi-Fi at home, the computer room at school, the internet — they are all networks. ## Main devices | Device | What it does | |---|---| | 🖥️ **Computer, phone** | Sends and receives information (a host) | | 🔀 **Switch** | Connects the devices in one room or on one floor | | 📡 **Router** | Joins different networks and sends packets the right way | | 🗄️ **Server** | Provides services to others, like files and web pages | | 📶 **Access point** | Gives a wireless (Wi-Fi) connection | | 🧱 **Firewall** | Blocks harmful access | ## How does information travel? Information is split into small pieces called **packets** and then sent. Like a letter, every packet has an **address** saying "from whom, to whom". Switches and routers read that address and deliver the packet to the right place. > 🎮 Try it: **Logic games → 🖧 Network lab**, the first task. > > 🧮 Problems: **Networks → Level 1**