About

Previously Mac OS X, is a series of Unix-based graphical interface operating systems developed, marketed, and sold by Apple Inc. It is designed to run exclusively on Mac computers, having been pre-loaded on all Macs since 2002. Releases of OS X are named after big cats: for example, OS X v10.8 is referred to as "Mountain Lion".

http://en.wikipedia.org/wiki/OS_X

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