What is an operating system (OS)?
An operating system(“OS") is a program that is initially loaded into the computer by a boot program. The OS then manages all the other programs in a computer. The other programs, called applications programs make use of the operating system by making requests for services through a defined application program interface (API). In addition, users can interact directly with the operating system through an user interface such as a command language or a graphical user interface (GUI)
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