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XNU ("X is Not Unix") is the computer operating system (OS) kernel developed at Apple Inc. since December 1996 for use in the Mac OS X (now macOS) operating system and released as free and open-source software as part of the Darwin OS, which, in addition to being the basis for macOS, is also the basis for Apple TV Software, iOS, iPadOS, watchOS, visionOS, and tvOS.
The history of macOS, Apple's current Mac operating system formerly named Mac OS X until 2011 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 Mac computers since their ...
Newer Xserve and Mac Pro machines will run a 64-bit kernel by default; newer iMac and MacBook Pro machines can run a 64-bit kernel, but will not do so by default. [44] Users wishing to use the 64-bit kernel on those machines must hold down the numbers 6 and 4 on the keyboard while booting to get the 64-bit kernel to load.
Mac OS X 10.2 – also marketed as Jaguar; Mac OS X Panther – 10.3; Mac OS X Tiger – 10.4; Mac OS X Leopard – 10.5; Mac OS X Snow Leopard – 10.6; Mac OS X Lion – 10.7 – also marketed as OS X Lion; OS X Mountain Lion – 10.8; OS X Mavericks – 10.9 (free) OS X Yosemite – 10.10 (free) OS X El Capitan – 10.11 (free) macOS Sierra ...
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 [4] and was released on September 25, 2017.
macOS Catalina (version 10.15) is the sixteenth major release of macOS, Apple Inc.'s desktop operating system for Macintosh computers. It is the successor to macOS Mojave and was announced at WWDC 2019 on June 3, 2019 and released to the public on October 7, 2019.
OS X Lion, [5] [6] also known as Mac OS X Lion, [2] (version 10.7) is the eighth major release of macOS, Apple's desktop and server operating system for Mac computers. A preview of OS X 10.7 Lion was publicly shown at the "Back to the Mac" Apple Special Event on October 20, 2010.
Mac OS X Snow Leopard (10.6), released in August 2009, was the first version of Mac OS X (later macOS) to require a Mac with an Intel processor, ending operating system support for PowerPC Macs three years after the transition was complete.