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An operating system (OS) is a software program that enables the computer hardware to communicate and operate with the computer software. Without an operating system, the computer hardware and software programs would be non-functional.

When computers were first introduced the user interacted with them using a command line interface, which required the user to perform a series of commands in order to interact with the computer and its hardware and software. Today, almost every computer is using a Graphical User Interface (GUI) operating system that is much easier to use and operate.

Examples of computer operating systems :

  • Microsoft Windows 7 - PC and IBM compatible operating system. Microsoft Windows is the most commonly found and used operating system
  • Apple MacOS - Apple computer's operating system
  • Ubuntu Linux - A popular variant of Linux used with PC and IBM compatible computers
  • Google Android - operating system used with Android compatible phones
  • iOS - Operating system used with the Apple iPhone
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