- user interface (GUI graphical user interface/ CLI command line interface)
- Program executaion
we must be able to run and executed programs we have in our computer system.
- I/O Operations.
Input /Output operations must be provided by the operating system and user cannot directly control the I/O devices.
- File System Manuplation
o/s must controls how these files are control or manuplated.
A communication b/w process is a must requied by the operating system.
- Error Detection
o/s must handle all time of erros. (like printer not working) , maybe a debugging menu
- Resource Allocation
it must allocated resources to the process who needs it.
Which user use how much and which resources ? O/S keeps a track of this.
- Protection and Security.
Processes do not interfare with each other. and system should not be access from any out sider