The most important program that runs on a computer. Every general-purpose computer must have an operating system to run other programs. 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. Operating systems provide a software platform on top of which other programs, called application programs, can run. The application programs must be written to run on top of a particular operating system. Your choice of operating system, therefore, determines to a great extent the applications you can run. For PCs, the most popular operating systems are DOS, OS/2, and Windows, but others are available, such as Linux. In this article, the author wrote a brief summary of the operating system and explain it well.
(http://www.webopedia.com/TERM/o/operating_system.html)
2. The two reason why regional bank might buy six server computer instead of one super computer are:
- Because six server computers can manipulate more data at the same time.
- Because six server computers can perform faster than one super computer.
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