A Content Management System, or CMS, is the set of processes and technologies that support the collection, managing, and publishing of information in any form or medium. In the last 15 years or so, this information has typically been referred to as content or, to be precise, digital content.

Digital content may take the form of text (such as electronic documents, multimedia files (such as audio or video files), or any other file type that follows a content lifecycle requiring management.  To learn more about content management practices and processes, take some time to visit Wikipedia's very informative resource page.