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An exception to this was the Developer Transition Kit, which always reported the system version as "11.0". [9] macOS Big Sur started reporting the system version as "11.0" on all Macs as of the third beta release. To maintain backwards compatibility, macOS Big Sur identified itself as 10.16 to legacy software and in the browser user agent. [10]
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 ...
At macOS's core is a POSIX-compliant operating system built on top of the XNU kernel, [81] (which incorporated large parts of FreeBSD kernel [14]) and FreeBSD userland [14] for the standard Unix facilities available from the command line interface. Apple has released this family of software as a free and open source operating system named Darwin.
OS X El Capitan was released to end users on September 30, 2015, as a free upgrade through the Mac App Store. [ 6 ] OS X El Capitan is the final version of OS X to support aluminum Macs and Xserve , as its successor macOS Sierra is incompatible with the mid-2007 and final models of these products.
Darwin currently includes support for the 64-bit x86-64 variant of the Intel x86 processors used in Intel-based Macs and the 64-bit ARM processors used in the iPhone 5S and later, the 6th generation iPod Touch, the 5th generation iPad and later, the iPad Air family, the iPad Mini 2 and later, the iPad Pro family, the fourth generation and later ...
In addition, the Mac OS X kernel has been rebuilt to run in 64-bit mode on some machines. On those machines, Snow Leopard supports up to 16 terabytes of RAM. 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]
The operating system is named after Monterey Bay, continuing the trend of releases named after California locations since 2013's 10.9 Mavericks. macOS Monterey is the final version of macOS that supports the 2015–2017 MacBook Air, Retina MacBook Pro, 2014 Mac Mini, 2015 iMac and cylindrical Mac Pro, as its successor, macOS Ventura, drops ...
The current product lineup includes the MacBook Air and MacBook Pro laptops, and the iMac, Mac Mini, Mac Studio, and Mac Pro desktops. Macs are sold with Apple's proprietary macOS operating system , which is not licensed to other manufacturers and exclusively bundled with Mac computers.