The document defines and discusses the concept of Web 2.0. It notes that Web 2.0 emerged in 2003 with the rise of applications like blogs and social networks that allowed users to adopt a more active role in sharing information online. It explains that Web 2.0 enables users to share content and interact in a more immediate way through platforms like Blogger and Facebook. Finally, it outlines some of the main utilities of Web 2.0, including social networks, wikis, blogs, video hosting sites, online sales pages, and more.