The document discusses the evolution of the World Wide Web from static Web 1.0 to participatory Web 2.0 and the emerging Semantic Web or Web 3.0. Web 3.0 aims to add more context and meaning to online data through techniques like tagging, mapping, and natural language processing in order to better interconnect information and help computers assist users. Key aspects of the Semantic Web include using identifiers for things, representing relationships between things using languages like RDF and OWL, and using reasoners and queries to infer new conclusions and answers from semantically linked data.