This document discusses the definition and evolution of Web 2.0 and how it applies in healthcare. Web 2.0 is defined as enhancing creativity, information sharing, and collaboration among users on the World Wide Web. It is characterized by the web as a platform, harnessing collective intelligence, and remixing and sharing data. Examples of Web 2.0 applications include wikis, blogs, RSS feeds, podcasts, social networking, social bookmarking, photo sharing, and videos. These applications promote collaboration and sharing but also raise privacy and other issues. In healthcare, Web 2.0 is changing medicine through applications like podcasts, RSS, and social bookmarking, which can benefit professionals. Health 2.0 and Medicine 2.