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The World Wide Web

When most of us talk about using the "Internet", we're typically talking about a specific part of the Internet: the World Wide Web (WWW, or simply, the Web).
The Web is a massive network of webpages, programs, and files that are accessible via URLs.
We call it a web because of its vast interconnectedness. Starting from one URL, such as http://wikipedia.org, we can follow links to eventually reach millions of webpages from across the globe.
Here's a tiny portion of that web from 2004:
Image source: Chris 73, Wikipedia

Powered by protocols

A web browser loads a webpage using various protocols:
  1. It uses the Domain Name System (DNS) protocol to convert a domain name into an IP address.
  2. It uses the HyperText Transfer Protocol (HTTP) to request the webpage contents from that IP address.
It may also use the Transport Layer Security (TLS) protocol to serve the website over a secure, encrypted connection.
The web browser uses these protocols on top of the Internet protocols, so every HTTP request also uses TCP and IP.
The Web is just one of the applications built on top of the Internet protocols, but it is by far the most popular.
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