Joomla! started as a fork from Mambo in 2005, when many of the original developers of the Mambo CMS moved to working on Joomla! It has rapidly grown in popularity and, according to its own description, is a "Cutting Edge Content Management System and one of the most powerful Open Source Content Management systems in the world. It is used world-wide for anything from simple homepages to complicated corporate websites. It is easy to install, easy to manage and very reliable."
While the Joomla! CMS has the flexibility and power needed for complex, full-featured web applications, it is also simple to use to create basic websites. Its powerful, extensible template system can deal many different data types and control of user access, approval of content, scheduling of content display, and rich administrative controls are all included.