This document defines and explains common online terminology used on the internet. It provides definitions for terms like email, wiki, social bookmarking, HTML, podcast, VoIP, online chat, WWW, streaming, blog, social networking, URL, web feed. For each term it gives a brief 1-2 sentence explanation of what it refers to and sometimes includes additional details like related or historical terms. The purpose is to inform readers of terminology used for different online tools, platforms and technologies.