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OS X, formerly known as Mac OS X, is an operating system created and distributed by Apple Inc. for their Macintosh computers. Several versions have been released since the 1999 debut of Mac OS X Server 1.0. Although many people pronounce it literally as "Oh ess ex", it is in fact pronounced "Oh ess ten.", as the X in OS X is a Roman numeral for "ten". As of OS X 10.7 Lion, the "Mac" in "Mac OS X" was dropped from all marketing and promotional material, and with OS X 10.8 Mountain Lion, the "Mac" was dropped completely, making the current name "OS X".

This tag is for any and all questions related to OS X system software. For hardware, use .

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There are several -related tags which allow you to specify your operating system version, such as:

For server-related questions for OS X Server prior to Lion, use .
For questions regarding the Server.app for Lion and newer, use .

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