The Semantic Web represents a stage in the evolution of the World Wide Web. It extends the Web to make published information and data machine-readable, exchangeable, and usable. The information is assigned unique meanings and supplemented with additional details so that both humans and machines can recognize the meaning, context, and other relationships within the information (the semantics).
The Semantic Web is based on knowledge modeling or knowledge representation (for a specific knowledge domain).
Tim Berners-Lee (founder of the World Wide Web) described his proposal in 2001 as follows:“The Semantic Web is an extension of the current web in which information is given well-defined meaning, better enabling computers and people to work together.”