Definition: operating system (OS): An operating system (OS) is a program that allows you to interact with the computer -- all of the software and hardware on your computer. How? Basically, there are two ways: 1. With a command-line operating system (e.g., DOS), you type a text command and the computer responds according to that command. 2. With a graphical user interface (GUI) operating system (e.g., Windows), you interact with the computer through a graphical interface with pictures and buttons by using the mouse and keyboard. With Unix you have in general the option of using either command-lines (more control and flexibility) or GUIs (easier).
operating system (OS)
By Juergen Haas, About.com Guide
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