Operating system is a program that acts as an intermediary between a user of a computer and the computer hardware.

Operating system goals:

Execute user programs and make solving user problems easier.

Make the computer system convenient to use.

Use the computer hardware in an efficient manner.

Functions:

OS is a resource allocator.

Manages all resources

Decides between conflicting requests for efficient and fair resource use

OS is a control program.

Controls execution of programs to prevent errors and improper use of the computer