The World Wide Web Consortium (W3C) is the main international standards organization for the Web. Founded by Tim Berners-Lee in 1994, the W3C develops specifications and guidelines intended to ensure the long-term growth and interoperability of web technologies.
Key W3C specifications include HTML, CSS, the Web Accessibility Guidelines (WCAG), and the ActivityPub protocol for federated social networking. The W3C also maintains specifications for RDF and JSON-LD, which provide structured data vocabularies for the semantic web.