Drupal is a free and open-source content-management framework written in PHP. It is used as a back-end framework for at least 2.1% of all Web sites worldwide ranging from personal blogs to corporate, political, and government sites including WhiteHouse.gov and data.gov.uk. It is also used for knowledge management and business collaboration.
Drupal must be installed on the web server hosting the needed content. UNCC has Drupal hosting as a service which is described here.