Difference between multitasking, multithreading and multiprocessing?

Question

Whats the difference between multitasking, multiprogramming & multiprocessing

This comes regularly for my university OS exams and I can\'t find a good answer. I

Answer 1

MULTIPROCESSING is like the OS handling the different jobs in main memory in such a way that it gives its time to each and every job when other is busy for some task such as I/O operation. So as long as at least one job needs to execute, the cpu never sit idle. and here it is automatically handled by the OS, without user interaction with computer.

But when we say about MULTITASKING, the user is actually involved with different jobs as at one time - minesweeper or checking mail or anything. The cpu executes multiple jobs by switching among them, but the switching is so fast that user has the illusion that both the applications are running simultaneously.

So the main difference between mp and mt is that in mp the OS is handling different jobs in main memory in such a way that if some job is waiting for something then it will jump for the next job to execute. And in mt the user is in interaction with the system and getting the illusion as both or any of the applications are running simultaneously.