Operating System
The operating system is the most important program that runs on a computer. Every general-purpose computer must have an operating system to run other programs and applications. Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers.
For large systems, the operating
system has even greater responsibilities and powers. It is like a traffic cop
-- it makes sure that different programs and users running at the
same time do not interfere with each other. The operating system is also
responsible for security, ensuring that unauthorized users do
not access the system.
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