A Content-Management System (CMS) is a system for the shared creation, editing and organisation of content. Content can consist of text and multi-media documents. In most cases, an author can use such a system without programming or HTML skills. In this context, the information content to be presented is referred to simply as ‘content’. Among the best-known open-source CMSs are Joomla, Wordpress, TYPO3 and Drupal. Wordpress and Joomla are the most commonly used.