This document defines key terms related to content management systems and WordPress. It explains that a content management system is software used to manage digital content creation and modification. It then goes on to define common WordPress concepts like the front-end and back-end interfaces, themes, plugins, SEO, user management tools, email management, document managers, blogs, Gravatar, VaultPress, Jetpack, Akismet, trackbacks, pingbacks, IntenseDebate, Tumblr, CrowdSignal polls, programming languages like PHP and MySQL, and the differences between WordPress.com and WordPress.org platforms.