If you are an experienced Joomla! user, this Joomla site will seem very familiar but also very different. The biggest change is the new administrator interface and the adoption of responsive design. Hundreds of other improvements have been made.
Joomla! 3 continues development of the Joomla Platform and CMS as a powerful and flexible way to bring your vision of the web to reality. With the new administrator interface and adoption of Twitter Bootstrap, the ability to control its look and the management of extensions is now complete.