How Does the Internet Route Your Data?

Imagine sending a letter to a friend who lives far away. You put it in an envelope with their address and drop it in the mailbox. The postal service sorts it through various local post offices until it reaches your friend's house. The internet works similarly but much faster.

When you click a link, your computer wraps your request into small packages called packets. Each packet has a label with your address (where it is) and the destination address (the website you want).

These packets travel through glowing tubes of light under oceans and across land. Along the way, they meet robotic sorters called routers. A router looks at the label on a packet and decides which road to send it down next.

There are many different roads in the internet network. Routers use maps to find the fastest route for each packet. Sometimes two packets take slightly different paths but still arrive at the same place. If one road is blocked by traffic, the router sends the packet around the blockage like a detour sign.