Question

what is an operating system ? explain the major function of an operating system

Answer 1

An operating system is system software that manages computer hardware and software resources and provides common services for computer programs.
An operating system has three main functions:
(1) manage the computer's resources, such as thecentral processing unit,memory, disk drives, and printers.
(2) establish a user interface.
(3) execute and provide services for applications software.

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Answer 2

When a brand new computer comes off the factory assembly line, it can do nothing. The hardware needs software to make it work. Are we talking about applications software such as word processing or spreadsheet software? Partly. Figure 1: The Operating System in a HierarchyBut an applications software package does not communicate directly with the hardware. As shown in Figure 1, between the applications software and the hardware is a software interface - an operating system. An operating system is a set of programs that lies between applications software and the computer hardware. Conceptually the operating system software is an intermediary between the hardware and the applications software. Incidentally, the term system software is sometimes used interchangeably with operating system, but system software means all programs related to coordinating computer operations. System software does include the operating system, but it also includes the BIOS software (see the CPU chapter), drivers, and service programs, which we will discuss briefly in this chapter (see Figure 2).
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