Why do we need an operating system?

An operating system is an interface between the user and the computer. The prime objective of the operating system is to improve the efficiency of a computer system. It is also needed for the following tasks —

1. Ensuring the smooth functioning of the various peripherals attached.
2. Supervising the various processes and applications of the computer and enabling them to function in an efficient manner.
3. Coordinating the different hardware and software components of a computer system.
4. Managing computer's memory.