MaDeMoiSeLLe :)

1. system that controls all the programs installed in a computer.It provides user-interface between users and the computer itself.
2. It provides support for loading and execution of other application programs.
3. It has system tools that monitor the computer performance, debug problems or maintain parts of the sytem.
4. An operating system is like a resource manager. It contorls how processes to access resources.
5. It protects applications from each other but yet share physical resources between them.
6. It provides virtual machine such as virtual processor and share CPU.
7. It also allocate and protect memory, enable virtual memory operations for application programs.
8. It manages files by using filling system and divide up storage space.
9. It organizes and control hardware and software so that it operates in predictable way.
10. It manages the networking within the computer.
11. It transforms the the physical world of devices, instructions, memory, and time into virtual world.
12. It ensure the applications continue to run when the hardware updates and upgrades occur.
13. It provides a consistent application interface, especially important if there is more than one of a particular type of computer using the operating system.
14. The operating system provides a virtual proccessor to provide the illusion that a computer is doing more than one thing at a time.
15. It provides device driver to that perform operations on behalf of programs for example input/output operations.
16. It introduces new functions as it abstracts the hardware. As an example, it introduces file abstraction so that programs do not have to deal with discs.
17. It can protects the system by controlling access to programs.
18. It responsible towards secondary-storage management such as free-space management, disc scheduling and storage allocation.
19. It keep tracks which part of memory are being used, allocate/deallocate memory space as required.
20. It deals with hardware specific driver for devices and keep it all hidden from the rest of the system.

20 CORE FUNCTIONS OF OPERATING SYSTEM