What is an Operating System?
An operating system is a set of instructions that are loaded into
a computer's memory when you first turn it on. It manages all of the
other application programs (word processors, games,
drawing programs, spreadsheets, etc.).
Application programs make requests to the operating system to do things
like read and write from a disk, play a sound, and draw on the screen.
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Examples of Operating Systems:
Microsoft DOS, Microsoft Windows,
Mac OS, OS/2, UNIX, Linux, BeOS...
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