Major revision 10, from 2001 to present, is branded OS X (originally referred to as Mac OS X). Up to major revision 9, from 1984 to 2000, it is historically known as Classic Mac OS. Macintosh operating systems have been released in two major series. The Macintosh, specifically its system software, is credited with having popularized the early graphical user interface concept. Referred to by its major revision starting with "System 6 and "System 7", Apple rebranded version 7.6 as "Mac OS" as part of their Macintosh clone program in 1996. The original operating system was first introduced in 1984 as being integral to the original Macintosh, and referred to as the "System". for their Macintosh line of computer systems.
LATEST VERSION OF MAC OS X IS CALLED SERIES
Mac OS is a series of graphical user interface-based operating systems developed by Apple Inc. At the 2013 Apple Worldwide Developers Conference, Apple indicated that OS X 10.9 Mavericks and future OS X releases would be named after California locations. Releases of OS X prior to 10.9 were named after big cats the previous version of OS X, 10.8, is named Mountain Lion. Mac OS X v10.5 Leopard, when running on Intel processors, Mac OS X v10.6 Snow Leopard, OS X v10.8 Mountain Lion, OS X v10.9 Mavericks, and OS X v10.10 Yosemite are all certified UNIX systems, conforming to the Single UNIX Specification. The most recent and current UNIX certified version OS X 10.10 Yosemite was made available on October 16, 2014. Since then, six more distinct "client" and "server" editions of Mac OS X were released, thereafter starting with Mac OS X v10.7 Lion, OS X Server is no longer offered as a separate operating system product instead, the server management tools are available for purchase separately. 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. Unlike its predecessor, OS X is a UNIX 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. Mac OS had been Apple's primary operating system since 1984, and the family was backward compatible, so OS X could virtualize Mac OS 9 until version 10.5. Although, under its original name of Mac OS X, it was officially designated as simply "version 10" of the Mac OS, "version 9" has a completely different codebase as well as dramatic changes in user interface. OS X is Apple Inc.'s current Mac OS line of operating systems.
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