This document defines and describes several common Internet technologies including email, social bookmarking, wikis, HTML, podcasts, VoIP, URLs, and the World Wide Web. Email allows digital messages to be exchanged between users. Social bookmarking enables users to tag and share bookmarks online rather than saving them locally. Wikis are websites that allow users to collaboratively add, edit, and delete content. The document also defines HTML, podcasts, VoIP, URLs, and the World Wide Web.