What Service Does Operating System Provide?

Operating system provides services in following areas:

PROGRAM DEVELOPMENT: The operating system provides a variety of facilities and services, such as editors and debuggers, to assist the programmer in creating programs. Typically, these services are in the form of utility programs that, while not strictly part of the core of the operating system, are supplied with the operating system and are referred to as application program development tools.

PROGRAM EXECUTION: A number of tasks need to be performed to execute a program. Instructions and data must be loaded into main memory. I/O devices and files must be initialized, and other resources must be prepared. The operating system handles these scheduling duties for the user.

ACCESS TO I/O DEVICES:  each I/O device requires its own peculiar set of instructions or control signals for operation. The operating system provides a uniform interface that hides these details so that the programmer can access such devices using simple reads and writes.

ACCOUNTING: A good operating system will collect usage statistics for various resources and monitor performance parameters such as response time. On any system, this information is useful in anticipating the need for future enhancements and in tuning the system to improve performance. On a multi-user system, the information can be used for billing purposes.

An operating system is a group of short programs which provide the following facilities.
They schedule,load ,initiate and supervise the execution of the programs.
They also allocate the storage ,input /output units and other facilities of computer system.
They can handle errors and restart.
They co-ordinate for communications between operator and computer system.They also maintain a log of computer operations.In addition to these functions,they control multi-programming,multi-processing or time-sharing mode also.