The third generation of the evolution of web technologies. The web, also known as the World Wide Web, is the foundational layer for how the internet is used, providing website and application services.

With Web 1.0 and Web 2.0 technologies, Hypertext Markup Language (HTML) defines the layout and delivery of webpages. HTML will continue to be a foundational layer with Web 3.0, but how it connects to data sources and where those data sources reside could be somewhat different than earlier generations of the web.

Web 4.0 services will be autonomous, proactive, content-exploring, self-learning, collaborative, and content-generating agents based on fully matured semantic and reasoning technologies as well as AI. They will support adaptive content presentation that will use the Web database via an intelligent agent. Examples might be services interacting with sensors and implants, natural-language services, or virtual reality services.