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en.wikipedia.org/wiki/Macintosh_operating_systems

The family of Macintosh operating systems developed by Apple Inc. includes the graphical user interface-based operating systems it has designed for use with its Macintosh series of personal computers since 1984, as well as the related system software it once created for compatible third-party systems.

www.apple.com/macos

Switch it on in the General pane in System Preferences to create a beautiful, distraction-free working environment that’s easy on the eyes — in every way. Dark Mode works with built-in apps that come with your Mac, and third-party apps can adopt it, too.

support.apple.com/en-us/HT201260

Use About This Mac to see which Mac operating system your Mac is using. Is your Mac operating system (macOS) up to date? Is it the macOS version required by a product or feature that you want to use?

whatis.techtarget.com/definition/Mac-OS

Mac OS is the computer operating system for Apple Computer's Macintosh line of personal computers and workstations. A popular feature of its latest version, Mac OS X , is a desktop interface with some 3-D appearance characteristics.

en.wikipedia.org/wiki/Operating_system

macOS (formerly "Mac OS X" and later "OS X") is a line of open core graphical operating systems developed, marketed, and sold by Apple Inc., the latest of which is pre-loaded on all currently shipping Macintosh computers. macOS is the successor to the original classic Mac OS, which had been Apple's primary operating system since 1984.

www.britannica.com/technology/Mac-OS

Mac OS, operating system (OS) developed by the American computer company Apple Inc. The OS was introduced in 1984 to run the company’s Macintosh line of personal computers (PCs). The Macintosh heralded the era of graphical user interface (GUI) systems, and it inspired Microsoft Corporation to ...

download.cnet.com/s/utilities-op-systems-updates/mac

The Operating Systems and Updates category feature the latest update for your system's OS and hardware. Utilities include OS service packs, automatic driver updaters, and more. Filter

www.techopedia.com/.../2639/macintosh-operating-system-mac-os

The Macintosh Operating System (Mac OS) is an operating system (OS) designed by Apple Inc. to be installed and operated on the Apple Macintosh series of computers. Introduced in 1984, it is a graphical user interface (GUI) based OS that has since been released as multiple different versions.

www.computerhope.com/history/macos.htm

Apple introduced System 7 operating system on May 13, 1991. 1995 Apple allows other computer companies to clone its computer by announcing its licensed the Macintosh operating system rights to Radius on January 4.

www.operating-system.org/betriebssystem/_english/bs-macos.htm

Mac System Software Mac OS was named by the company Apple as "Mac System Software" in the beginning, a specially designed operating system only for 68K first Motorola processors. With own Macintosh hardware, Mac OS takes up a special role in the world of desktop systems. The first version was "System 1" and appeared bundled with the Mac in 1984.