World Wide Web

The World Wide Web is a system of interlinked documents and applications that people access over the Internet, usually through a browser. Its defining idea is the hyperlink: text or other content that, when clicked, jumps to another page. By connecting documents across the world in this way, the web turned the Internet into an easily navigable space for information and interaction.

The web is not the same as the Internet. The Internet is the underlying network; the web is one of the most popular services that runs on it, alongside email, messaging, and file transfer.

Invention

The web was proposed at the end of the 1980s by Tim Berners-Lee, a British scientist working at a physics laboratory in Europe, as a way for researchers to share documents. He built the first browser and server and defined the core technologies. In the early 1990s the specifications were made freely available, which encouraged rapid adoption. The first widely used graphical browsers, appearing in the mid-1990s, opened the web to the general public.

Core technologies

Three standards form the foundation:

HTML. HyperText Markup Language describes the structure and content of a page — headings, paragraphs, links, and so on. Browsers interpret it and render the result.

HTTP. The HyperText Transfer Protocol defines how a browser requests a resource from a server and how the server responds. Its secure version, HTTPS, encrypts the exchange.

URLs. Uniform Resource Locators are the addresses that identify each resource on the web, typically including a domain name and a path.

On top of these, Cascading Style Sheets (CSS) control appearance, and JavaScript adds interactivity. Browsers fetch pages, parse them, and display them, following links as the user clicks.

How pages are delivered

When a user enters an address, the browser resolves the domain name to a server address, sends an HTTP request, and receives a response — often an HTML document plus supporting files such as styles, scripts, and images. Search engines crawl and index pages so they can be found by keyword. Content ranges from static pages, which are the same for everyone, to dynamic pages generated on the fly, and to modern web applications that behave much like installed software.

Evolution

The early web was largely read-only: pages published by organisations and read by visitors. Over time, users became contributors through blogs, social media, and wikis — often called the "read-write" web. More recently, the web has become a platform for full applications, with ever-richer interfaces, cloud services, and mobile use. Standards continue to develop, improving performance, accessibility, and security.

Impact

The web has transformed how people find information, shop, learn, work, and connect. It underpins e-commerce, online banking, streaming, remote collaboration, and much of modern journalism and entertainment. It lowered the barriers to publishing, letting individuals reach a global audience.

At the same time, it brings concerns: misinformation, tracking and privacy, security threats, and the dominance of a few platforms. Accessibility and the digital divide also matter, since not everyone has equal access to devices or connectivity.

Standards and openness

The web is guided by open standards developed collaboratively by international bodies and the wider community. This openness — anyone can publish, and no single company controls the core formats — has been central to the web's success and is a recurring theme in debates about its future.

Search and discovery

Because the web contains an enormous and ever-growing number of pages, finding information depends on search engines. These programs crawl pages by following links, analyse their content, and build an index that lets results be returned almost instantly for a query. Search engines also rank results, aiming to show the most relevant and useful pages first. This system made the web navigable at scale and became a primary way people encounter information, which in turn shaped how content is written and optimised.

Privacy and tracking

As the web became interactive, it also became a place where behaviour can be observed. Cookies and similar technologies let sites remember logins and preferences, but they can also be used to track users across many sites for advertising. Concerns about privacy have led to regulation in some regions and to browser features that block or limit tracking. Users increasingly weigh convenience against how much of their activity is collected and shared.

Accessibility and the open web

Because the web reaches so many people, designing it to work for everyone matters. Accessibility practices — clear structure, readable text, keyboard navigation, and support for screen readers — help users with disabilities and often improve usability for all. Alongside this, the open nature of the web's standards lets anyone build a site without asking permission, which has encouraged both innovation and competition. Debates continue about how to preserve that openness while addressing problems such as misinformation, monopolies, and harmful content.

Authoring and hosting

Creating a web page can be as simple as writing HTML and placing files on a server, though most sites now use content-management systems or frameworks. Hosting ranges from shared services for small sites to global cloud platforms that scale to millions of visitors. This low barrier to publishing is a defining strength of the web.

Common misconceptions

The most common confusion is treating the web and the Internet as identical; they are not. Another is thinking the web is "owned" by a particular company, when its core standards are open. Some assume all web content is trustworthy or permanent, though pages can change or disappear and not every source is reliable. Finally, people often overlook that the web depends on physical infrastructure — servers, cables, and data centres — to function.

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