What is an Operating System?

      An operating system (OS) is the program that, after being initially loaded into the computer by a boot program, manages all of the other application programs in a computer. The application programs make use of the operating system by making requests for services through a defined application program interface (API). In addition, users can interact directly with the operating system through a user interface, such as a command-line interface (CLI) or a graphical UI (GUI).



Function Of Operating System

Operating system performs three functions:

  1. Convenience: An OS makes a computer more convenient to use.
  2. Efficiency: An OS allows the computer system resources to be used in an efficient manner.
  3. Ability to Evolve: An OS should be constructed in such a way as to permit the effective development, testing and introduction of new system functions at the same time without interfering with service.

Features Of Operating System

  • Provides a platform for running applications.
  • Handles memory management and CPU scheduling.
  • Provides file system abstraction.
  • Provides networking support.
  • Provides security features.
  • Provides user interface.
  • Provides utilities and system services.
  • Supports application development.

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