Joomla is a free and open-source content management system – CMS for publishing web content. It is built on a model–view–controller web application framework that can be used independently of the CMS.
Joomla! is an award-winning content management system – CMS, which enables you to build Web sites and powerful online applications. Many aspects, including its ease-of-use and extensibility, 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