Classic Mac OS is a colloquial term used to describe a series of operating systems developed for the Macintosh family of personal computers by Apple Inc. from 1984 until 2001. The Macintosh operating system is credited with having popularized the graphical user interface concept.What are all the Mac OS names?
Mac OS X & macOS version code names OS X 10 beta: Kodiak - 13 September 2000 OS X 10.0: Cheetah - 24 March 2001 OS X 10.1: Puma - 25 September 2001 OS X 10.2: Jaguar - 24 August 2002 OS X 10.3 Panther (Pinot) - 24 October 2003 OS X 10.4 Tiger (Merlot) - 29 April 2005 [OS X 10.4.4 Tiger (Chardonnay)] OS X 10.5 Leopard (Chablis) - 26 October 2007How do you check Mac OS version?
How to Find Your OS X Version Number Click the Apple icon at the top left of your screen. Choose the first item in the menu, “About This Mac.” Take note of your Mac operating system, both by its codename and its version number. For instance, this is v10.10.5, also known as Yosemite.What is the current version of the Apple OS?
To see which version of macOS you have installed, click the Apple menu icon at the top left corner of your screen, and then select the "About This Mac" command. The name and version number of your Mac's operating system appears on the "Overview" tab in the About This Mac window.