This document introduces Web 2.0 and its key concepts. It discusses how Web 2.0 enables everyone to participate and contribute through tools that connect people, ideas, and resources in a global conversation. Examples of popular Web 2.0 tools are given, such as blogs, wikis, YouTube, and Flickr. The document also discusses how Web 2.0 can be applied in educational practice by supporting fundamental literacies of connecting, contributing, collaborating, and creating.