How the Internet Actually Works: From Your Click to the Page
The internet is not a cloud. It is cables, computers, and a few simple rules. Follow one click from your phone to a website and back, step by step.
When you open a website, it feels like magic. In fact, a lot of ordinary machines pass small messages to each other in a fraction of a second. Once you see the steps, the internet stops being mysterious.
The internet is a network of networks
The word "internet" means inter-connected networks. Your home Wi-Fi is one small network. Your internet provider runs a bigger one. Companies, universities, and governments run others. Thick cables, including cables laid under the sea, join them all together. The "cloud" is simply other people's computers, kept in large buildings called data centres.
What happens when you open a website
You type an address
For example `example.com`. Humans like names, but computers use numbers called IP addresses, like 192.0.2.44.
Your device asks DNS
A service called DNS works like a phone book. It translates the name into the number. We explain DNS in another article.
Your request is chopped into packets
Data is split into small pieces called packets. Each packet carries the sender and destination address, like a numbered envelope.
Routers pass the packets along
Special machines called routers read the destination and send each packet to the next best stop. Packets may take different routes.
The website's server replies
The server, a computer that stores the website, sends the page back, also in packets.
Your device reassembles the page
Packets are put back in order, and your browser draws the page for you.
Why it is so reliable
Because packets can take any route, if one cable or router fails, the packets can go around it. This idea of flexible routing was one of the original design goals of the early internet.
Internet vs the Web
People use these words as if they mean the same thing, but they are different:
- The internet is the network and its wiring.
- The World Wide Web is one service that runs on it: websites you open in a browser.
- Email, video calls, online games, and apps also use the internet without using the web.
What most people miss
- Most of the world's data travels through undersea cables, not satellites. Satellites carry a much smaller share.
- Your speed depends on many parts: your Wi-Fi, your provider, the website's server, and the distance between you and it.
- There is no central owner. No single company or government runs the whole internet.
