macOS (/ ˌ m æ k oʊ ˈ ɛ s / ; previously Mac OS X and later OS X) is a series of proprietary graphical operating systems developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers.
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macOS (originally named "Mac OS X" until 2012 and then "OS X" until 2016) is the current Mac operating system that officially succeeded the classic Mac OS in 2001. Although the system was originally marketed as simply "version 10" of Mac OS, it has a history that is largely independent of the classic Mac OS.
The history of macOS, Apple's current Mac operating system originally named Mac OS X until 2012 and then OS X until 2016, began with the company's project to replace its "classic" Mac OS. That system, up to and including its final release Mac OS 9, was a direct descendant of the operating system Apple had used in its Macintosh computers since their introduction in 1984. However, the current macOS is a Unix operating system built on technology that had been developed at NeXT from the 1980s until
macOS, formerly Mac OS X from 2001 to 2012 and OS X until 2016, is the name of an operating system for computers made by Apple Inc. These are called Macintosh computers, or Macs. macOS first came out in 2001, and is completely different than the "classic" Mac OS that it replaced.
macOS Mojave (/ m oʊ ˈ h ɑː v i, m ə-/ mo-HAH-vee) (version 10.14) is the fifteenth major release of macOS, Apple Inc.'s desktop operating system for Macintosh computers. Mojave was announced at Apple's Worldwide Developers Conference on June 4, 2018, and was released to the public on September 24, 2018.
macOS Sierra (version 10.12) is the thirteenth major release of macOS (previously Mac OS X from 2001 to 2012 and OS X from 2012 to 2016), Apple Inc.'s desktop and server operating system for Macintosh. It was the first version of the operating system issued under the June 2016 rebranding as macOS.
macOS Catalina (version 10.15) is the sixteenth and, as of May 2020, current major release of macOS, Apple's desktop operating system for Macintosh computers. It is the successor to macOS Mojave . It was announced at WWDC 2019 on June 3, 2019, and was released to the public on October 7, 2019.
macOS High Sierra (version 10.13) is the fourteenth major release of macOS, Apple Inc. 's desktop operating system for Macintosh computers. macOS High Sierra was announced at the WWDC 2017 on June 5, 2017 and was released on September 25, 2017. The name "High Sierra" refers to the High Sierra region in California.