This document defines common online terminology such as email, wikis, social bookmarking, HTML, podcasts, VoIP, online chat, the World Wide Web, streaming, social networking, URLs, blogs, and web feeds. Email allows electronic messaging between computer users via networks. Wikis are online encyclopedias that can be edited by volunteers, like Wikipedia. Social bookmarking enables users to bookmark and share web documents. HTML is the main language used to create web pages. Podcasts are episodic audio or video files that can be subscribed to. VoIP delivers voice calls over the internet.