The World Wide Web

The World Wide Web is a global collection of documents that can point at one another regardless of where they physically sit. Its power comes from three modest conventions working together. A URL gives every document a single universal address, so a link can name any page anywhere on Earth. HTTP is the request-and-response protocol a browser and a server use to fetch that document. HTML is the markup that describes a page's structure and, crucially, embeds links — clickable references to other URLs. Put these together and you get hypertext without borders: a document in one country can link straight into a document in another, and following that link is a single click. People often conflate the web with the internet, but they are different layers — the internet moves packets between machines; the web is one of the things those packets carry.

The internet had existed for years, but using it meant juggling a grab-bag of separate, unfriendly tools — one program to fetch files, another to read news, another to log into a distant machine, each with its own commands. Information was out there, but scattered and hard to reach. Berners-Lee's insight was to unify it behind a single idea — the addressable, linkable document — so that everything became reachable the same way, by naming its URL or following a link to it. That collapsed the effort of getting at information almost to nothing and, just as importantly, made *publishing* nearly free: writing a page and putting it on a server let anyone, anywhere, reach it. The web turned the internet from a specialists' network into a public medium.

Berners-Lee, working at CERN, wrote the proposal in 1989 to solve a local problem: the laboratory's knowledge kept getting lost as people and projects came and went, and he wanted a way to link documents across incompatible systems. Over 1990 he built the pieces himself on a NeXT computer — the first web server, the first browser (called WorldWideWeb), and the first versions of URLs, HTTP, and HTML. The first web page went online in August 1991 at info.cern.ch, describing the project and how to join it. Growth was slow until graphical browsers such as Mosaic (1993) made the web easy for non-experts, and that same year CERN renounced all rights and released the web's software into the public domain, ensuring no company could own or charge for the standard. That decision — openness by design — is much of why the web, and not some proprietary rival, became universal.

The web became the dominant way people use the internet and, for most of the world, the internet's public face. Search engines, online encyclopedias, social networks, e-commerce, streaming, and web applications all live on the foundation Berners-Lee laid, and the open standards he insisted on let anyone build on it without permission. By making essentially all of human knowledge addressable, linkable, and searchable in one place, it also assembled — as a side effect — the vast body of text on which later search engines and language models would be trained. Almost every human-facing service built on the internet since 1993 is, in practice, a web page.