What Is Operating System? (© All Computer Studies)

An operating system or OS is a software program that enables the computer hardware to communicate and operate with the computer software. Without a computer operating system, a computer and software programs would be useless. In the picture to the right, is an example of Microsoft Windows XP, a popular operating system and what the box may look like if you were to visit a local retail store to purchase it.

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 operating system. The only Apple computer 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.