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How does a router work?

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Quick answer

A router forwards data packets between your local network and the internet by reading each packet's destination address and choosing a path to send it onward. It also lets many devices share one connection, tracking which device requested what so replies arrive at the right place.

A router works by directing data between your devices and the internet, choosing the best path for each packet. It connects your home network to the wider internet, sharing one connection among many devices and steering traffic to the right place.

Step by step

  1. Your device sends data addressed to a destination, such as a website, to the router.
  2. The router reads the destination address on each packet and checks its routing table.
  3. It picks the best next hop toward that destination and forwards the packet out the right connection.
  4. The packet travels through other routers until it reaches the destination network.
  5. The reply comes back to your router, which notes which device asked and delivers it there.
  6. The router repeats this for every packet, so many devices can share one internet link.

Key things to understand

  1. It links your local network to the internet.
  2. It reads each data packet's destination address.
  3. It forwards packets along the most efficient route.
  4. It shares one internet connection among many devices.
  5. Home routers usually also broadcast Wi-Fi.

Labelled diagram

  1. Your device

    Creates data addressed to a destination like a website.

  2. Router

    Reads the destination and checks its routing table.

  3. Next hop

    Forwards the packet toward the destination network.

  4. Internet

    Other routers pass the packet along until it arrives.

  5. Reply

    Returns to your router, which sends it to the right device.

How a router moves a packet

Real-world examples

  • A laptop streaming a video sends packets through the home router, which forwards them to your internet provider.
  • A phone on Wi-Fi loads a webpage while a game console downloads an update, and the router keeps both streams separate.
  • In an office, a router links dozens of computers to one internet line and routes traffic between internal departments.
  • A smart speaker sends a voice request to the router, which forwards it to a cloud service and returns the answer.

Common mistake

✗ Myth: A router and a modem do the same job.

✓ Fact: A modem converts your provider's signal into a usable internet connection, while a router shares that connection among your devices and directs traffic between them and the internet.

People also ask

What is the difference between a modem and a router?
A modem connects your home to your internet provider's network, translating the signal that carries internet data. A router shares that single connection among your devices, assigns local addresses, and forwards packets between your local network and the internet. Many home gateways combine both functions in one box.
How does a Wi-Fi router send data?
A Wi-Fi router converts data into radio signals and broadcasts them on wireless channels. Each device has a unique address, so the router sends packets only to the intended device. It also receives radio signals from devices and forwards that data to the internet or other local devices.
Does a router slow down the internet?
A router adds a tiny delay because it must read and forward each packet, but this is usually too small to notice. Slow speeds more often come from your internet plan, Wi-Fi distance or interference, or many devices competing for bandwidth. A modern router rarely limits a typical home connection.
What does a router do?
It directs data packets between your devices and the internet, picking efficient paths and letting many devices share one connection.
What's the difference between a router and a modem?
A modem connects you to your internet provider; a router shares that connection among your devices and manages the local network.
How does a router share one connection?
It assigns each device a local address and tracks which device asked for what, so replies from the internet reach the right one.
How does a router work?
It reads the destination of each data packet and forwards it along the best path between networks.
Why does my router assign IP addresses?
So it can tell devices apart and deliver each one's data to the right place on your network.

Part of the guide: How the Internet Works →