Web 2.0 refers to second generation web-based communities and hosted services like social networking sites and wikis that emphasize online collaboration and sharing among users. Some key educational Web 2.0 tools include Hot Potatoes, which allows teachers to create interactive exercises; PTable, an interactive online periodic table; and Edmodo, a social learning platform where teachers can share content and students can collaborate. These tools make education more engaging, social, and accessible anywhere by facilitating user-generated content, multimedia sharing, and online collaboration.