WordPress is an open-source blogging and content-management system developed in PHP. Powered by a web server with PHP and MySQL backend engines, WordPress has evolved into the most popular blogging and content management platform (powering more than 75 million sites). There is a huge and growing ecosystem of WordPress design themes and plugins developed by third parties. WordPress supports collaborative blogging with multiple users, is euipped with built-in media and comment management system, and allows multiple sites to be powered by a single WordPress installation under one administrator.