What are the purpose of operating system and its functions?

The purpose of an operating system is to provide an environment in which a user can execute
programs in a convenient and efficient manner.

Functions：

1. System performance is boosted with the help of the OS.

2. Various applications or tasks and the number of users doing the tasks are accounted for by OS.

3. Security is provided by OS to the user data and prevents unauthorized access.

4. The computing system shows some errors due to the changes in the hardware and these errors are logged in the OS.

5. Many users use the computing system.

6. The main memory is managed by OS.

7. OS checks whether the system is ready to work.