Web 2.0 or Semantic Web is when the semantics of information and services on the Web is defined, thus allowing the Web to understand and satisfy the requests of people to use the Web content instantly.

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Web 2.0 refers to the second generation of the World Wide Web, focusing on the ability for people to collaborate and share information online via social media, blogs, and wikis. The Semantic Web (also known as Web 3.0) is an extension of the current web that enables data to be shared and reused across application, enterprise, and community boundaries, aiming to make the web's data machine-readable.

Web 20 or Semantic Web Is When the Semantics of Information