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en.wikipedia.org/wiki/Macintosh_operating_systems

macOS (originally named "Mac OS X" until 2012 and then "OS ... that officially succeeded the classic Mac OS in 2001.

en.wikipedia.org/wiki/MacOS

macOS is the current series of Unix-based graphical operating systems developed and ... Launched in 2001 as Mac OS X, the series is the latest in the family of Macintosh operating systems. Mac OS X succeeded "classic" Mac OS, which was ...

www.apple.com/macos/how-to-upgrade

Before you upgrade, we recommend that you back up your Mac. Then, if your Mac is running OS X Mountain Lion 10.8 or later, you can upgrade directly to ...

support.apple.com/en-us/HT201260

Oct 31, 2017 ... About This Mac shows the version and build of your Mac operating system. Is your Mac operating system up to date? Does it meet the system ...

www.apple.com/macos/high-sierra

macOS High Sierra Your Mac. ... People love working with their photos on a Mac. .... Performance will vary based on system configuration, network connection, ...

support.apple.com/en-vn/HT201686

Sep 27, 2017 ... If you try to use an incompatible macOS, your Mac might not finish starting up, or it might behave unexpectedly.

whatis.techtarget.com/definition/Mac-OS

Mac OS is the computer operating system for Apple Computer's Macintosh line of personal computers and workstations.

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 ...

www.businessinsider.com/apple-is-releasing-its-new-high-sierra-operating-system-for-mac-on-monday-2017-9

Sep 25, 2017 ... Apple has rolled out its free new High Sierra operating system (OS) for Mac. It is available to download by clicking the Apple logo in the top left ...