Fedora is an open source operating system using ''RPM-based'' -- linux distributions that use a tool to automate the process of installing, upgrading, configuring and removing ''software packages'' -- computer software that is stored in an ''archived format'' -- a format of storing compressed files -- to install programs -- from a computer --, built on top of the Linux kernel. It is developed and maintained by a ''community-support'' -- a group of programmers who contribute to the development of Fedora -- known as the Fedora Project which is sponsored by Red Hat. The Fedora Project's mission is "To lead the advancement of free and open source software and content as a collaborative community." Fedora’s main aim is to be a leader in the use and distribution on software designed as ''open source''-- the source code the proogram is readily available. -- Fedora has a release every six months and a maintenance period of about thirteen months for each of its releases. Fedora 12 was released November 11, 2009 and Fedora 13 has an expected release date of May 18, 2010.