A Content Management System, or CMS for short, is a website management program that allows non-technical people to easily update their websites. After logging into a browser-based administration area, the site manager or author can edit the site – make new or edit pages, add photos and more. WordPress is currently the most popular CMS by far — almost one-third of all sites in the world run on WordPress. Examples of other popular content management system include Joomla, Drupal, and Magneto.