Joomla! is a free open source content management system for publishing content on the World Wide Web and intranets. The system includes features such as page caching to improve performance, RSS feeds, printable versions of pages, news flashes, blogs, polls, website searching, and language internationalization. Joomla is licensed under the GNU General Public License, and is the result of a fork of Mambo. The name Joomla officially ends with an exclamation mark, but this is commonly omitted. It is written in the PHP programming language and uses the MySQL database by default.