What's CMS - content management system?

A content management system is software that keeps track of every piece of content on your Web site; much like your local public library keeps track of books and stores them. Content can be simple text, photos, music, video, documents, or just about anything you can think of. A major advantage of using a CMS is that it requires almost no technical skill or knowledge to manage. Since the CMS manages all your content, you don't have to.
note that : EgyMe is using up-to-date CMS