This document defines common online terminology in 3 sentences or less per term. It explains that e-mail allows transmission of messages over connected networks, wikis are the simplest online databases, social bookmarking helps users share websites, HTML uses codes to format text, podcasts allow downloaded or streamed audio, VoIP converts analog to digital for phone calls, online chat facilitates text and video communication, www allows searching the internet, blogs are individual online spaces, URLs locate files on the internet, web feeds update frequently changing content, and streaming delivers media files.