Give five functions of an operating system.

The five functions of an operating system are:

1. Processor Management — An operating system allocates the CPU to various running programs or applications.
2. Memory Management — An operating system allocates memory to the running processes and de-allocates memory from the process, when it gets completed.
3. File Management — An operating system governs the permanent storage and retrieval of data from/to an external storage device.
4. Device Management — An operating system is responsible for proper handling of input and output devices.
5. User Interface — An operating system establishes a standard means of communication between users and their computer systems.