The current Mac operating system is called macOS, originally named "Mac OS X" until 2012 and then "OS X" until 2016. The current macOS is preinstalled with every Mac and is updated annually. It is the basis of Apple's current system software for its other devices – iOS, iPadOS, watchOS, and tvOS.
Includes os versions: macOS
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. OS X has a modular design intended to make it easier to add new features to the operating system in the future. It runs UNIX applications as well as older Mac applications.