An operating system is a software program that manages and operates computing devices. Mac OS is a powerful operating system that offers similar features and services to Windows and Linux. The Macintosh Operating System (Mac OS) is an operating system developed by Apple Inc. It is a graphical user interface-based operating system that was first published in 1984. Apple is an American-based company located in California. Mac OS is meant to run on Apple computers and does not support the x86 architecture by default. Mac OS has multiple versions available such as Macintosh 128k, Mac OS 7, Mac OS X, and Mac Mountain Lion. ?Therefore, Mac is used by the Apple computer systems (an American technology company). Additional InformationMicrosoft Windows, usually known as Windows or Windows OS, is a personal computer operating system developed by Microsoft Corporation. Linux is a collection of open-source Unix-like operating systems based on Linus Torvalds' Linux kernel which was launched on September 17, 1991. Oracle Solaris is also an operating system.