An operating system is a collection (or suite) of programs that manages and controls the computer. Operating systems have many functions: A user interface is a program, or suite of programs that ...

The NeXTSTEP operating system poularized concepts like draggable app windows and full-color icons. Thomas Schanz / Wikimedia The initial release of NeXTSTEP took place on September 18, 1989.

The Ubuntu operating system brings the spirit of Ubuntu to the world of computers.” Simon Fraser University computer scientist Toby Donaldson says Ubuntu is popular because, unlike some other versions ...