An operating system (OS) is a collection of software that manages computer hardware resources and provides common services for computer programs. The operating system is a vital component of the system software in a computer system. Application programs usually require an operating system to function.
Examples of popular modern operating systems include Android, BSD, iOS, GNU/Linux, OS X, QNX, Microsoft Windows, Windows Phone, and IBM z/OS. All these, except Windows and z/OS, share roots in UNIX.
- Microsoft Windows – PC and IBM compatible 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.