History Of OS X
OS X is the newest of Apple Inc.'s Mac OS line of operating systems. Although, under its original name of Mac OS X, it was officially designated as simply "version 10" of the Mac OS, "version 9" had a completely different codebase, file system, design, and hardware support. Mac OS had been Apple's primary operating system since 1984, and the family was backward compatible, so OS X supported an emulated version 9 until version 10.5.
Unlike its predecessor, OS X is a Unix-like operating system built on technology that had been developed at NeXT through the second half of the 1980s and up until Apple purchased the company in early 1997. It was first released in 1999 as Mac OS X Server 1.0, with a desktop-oriented version (Mac OS X v10.0) following in March 2001. Since then, seven more distinct "client" and "server" editions of Mac OS X have been released, the most recent being Mac OS X v10.8, which was first made available on July 25, 2012. Releases of OS X are named after big cats; the current version of OS X is nicknamed "Mountain Lion".
Read more about History Of OS X: Development Outside of Apple, Internal Development, Changed Direction Under Jobs, Releases
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“Culture, the acquainting ourselves with the best that has been known and said in the world, and thus with the history of the human spirit.”
—Matthew Arnold (1822–1888)