What is System software? Describe the function of it.

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What is System software? Describe the function of it.
It is Interface between hardware and Application Software (or User). CPU coordinates with other parts in computer System due to system Software. And the jobs of it are:
To load itself in the memory (RAM) and it is called booting.
To load User program in the memory
To load Data through keyboard to RAM
To Interpret the program instructions one at a time
To display output (gives instruction to display) on the screen (printer too)
To read /write data from/into storage device.
To control hardware (activate when needed)
To act as a manager
To check input/output devices available

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