Explore the Joomla platform and learn how to use open-source content management system (CMS) for publishing web content. Joomla is a management system (CMS), which enables you to build Web sites and powerful online applications. Many aspects, including its ease-of-use and extensibility, user-frienldy web programming which have made Joomla the most popular Web site software available. Best of all, Joomla is an open source solution that is freely available to everyone.