Web 2.0 refers to a second generation of web development that facilitates communication, information sharing, and collaboration online. It allows for the creation of web-based communities and applications. Examples of Web 2.0 tools include Blabberize, which allows users to add voiceovers to images and videos; Animoto, which lets users create movies from their photos; and Delicious, a site for tagging and sharing topic-specific websites. The document provides links to these services and encourages exploring more at a listed Web 2.0 index site.