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macOS, originally Mac OS X, previously shortened as OS X, is a Unix-based [6] [7] operating system developed and marketed by Apple since 2001. It is the primary operating system for Apple's Mac computers.
Despite not having received security updates since 2009, Mac OS X 10.4 Tiger remains popular with Power Mac users and retrocomputing enthusiasts due to its wide software and hardware compatibility, as it is the last Mac OS X version to support the Classic Environment – a Mac OS 9 compatibility layer – and PowerPC G3 processors.
The classic Mac OS is the original Macintosh operating system introduced in 1984 alongside the first Macintosh and remained in primary use on Macs until Mac OS X in 2001. [ 6 ] [ 7 ] Apple released the original Macintosh on January 24, 1984; its early system software is partially based on Lisa OS , and inspired by the Alto computer, which ...
Mac OS (originally System Software; retronym: Classic Mac OS [a]) is the series of operating systems developed for the Macintosh family of personal computers by Apple Computer, Inc. from 1984 to 2001, starting with System 1 and ending with Mac OS 9. The Macintosh operating system is credited with having popularized the graphical user interface ...
macOS Sonoma (version 14) is the twentieth major release of macOS, Apple's operating system for Mac computers. The successor to macOS Ventura, it was announced at WWDC 2023 on June 5, 2023, [3] and released on September 26, 2023.
The last version of classic Mac OS, Mac OS 9, was introduced in 1999. Mac OS 9 was succeeded by Mac OS X in 2001. [196] Over the years, Mac OS X was rebranded first to OS X and later to macOS. [197] macOS is a derivative of NextSTEP and FreeBSD. It uses the XNU kernel, and the core of macOS has been open-sourced as the Darwin operating system.
Inside Macintosh covers only the classic Mac OS and a new set of documentation was introduced for Mac OS X. Initially this documentation includes only the Carbon Specification identifying the APIs in Carbon and the Cocoa documentation inherited from OpenStep.
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.