Mac OS X

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(Pronounced Mac Oh-Ess Ten) The latest operating system for Apple's Macintosh computers. Mac OS X is a development platform that supports multiple development technologies including UNIX, Java, the proprietary Cocoa and Carbon runtime environments, and a host of open source, Web, scripting, database and development technologies.

The macOS Sierra update (v10.12) is the most recent release of the Mac OS X / macOS operating system, following earlier updates for the OS: Cheetah (v10.0), Puma (v10.1), Jaguar (v10.2), Panther (v10.3), Tiger (v10.4), Leopard (v10.5), Snow Leopard (v10.6), Lion (v10.7), Mountain Lion (v10.8), Mavericks (v10.9), Yosemite (v10.10) and El Capitan (v10.11).