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Functions of Interrupts and system calls

What are the various functions of Interrupts and system calls?

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a.    Interrupts allow the CPU to switch back to the kernel mode, as this cannot be done automatically.

b.    The CPU consist of many interrupts which can allow certain types of events such as timers, keyboard and output devices to interrupt the CPU.

c.    For the events in the form of interrupts that are taking place in the CPU an interrupt handler is being setup to handle it.

d.    During the interrupt the CPU stops the working of the currently running program and it switches to the kernel mode.

e.    The interrupt handler is being executed to manage the events that are occurring in the system.

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