OS X El Capitan ( ) (version 10.11) is the twelfth major release of OS X (now named macOS), Apple Inc.'s desktop and server operating system for Macintosh computers. It was released after OS X Yosemite and focuses mainly on performance, stability and security. Starting with OS X Mavericks, future operating systems of OS X were named after regions of Northern California. El Capitan was named after a rock formation in Yosemite National Park, to highlight a refined version of its predecessory, OS X Yosemite.