What are the three main purposes of an operating system? solution

1. To provide an environment for a computer user to execute programs on computer hardware in a convenient and efficient manner.
2. To allocate the separate resources of the computer as needed to solve the problem given. The allocation process should be as fair and efficient as possible.
3. As a control program it serves two major functions: (1) supervision of the execution of user programs to prevent errors and improper use of the computer, and (2) management of the operation and control of I/O devices.