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content management system, or CMS, is a program for easily editing and placing content such as text, still images and videos on Web sites.
The CMS serves as a bridge between editors and the code running the Web site, limiting or eliminating the need for editors to know HTML or other computer languages. Most news sites use a CMS to efficntly manage a large amount of content. Some news sites use proprietary systems, while others use open-source systems such as Drupal. Blogs and wikis are also content management systems in that they allow users to post and edit entries using a graphical interface.
More reading:
List of content management systems (Wikipedia)
