Answer Posted / lalit arora

Multiprogramming: is a rudimentary form of parallel
processing in which several programs are run at the same
ime on a uniprocessor.Since there is only one processor,
here can be no true simultaneous execution of different
programs. Instead, the operating system executes part of one
program, then part of another, and so on. To the user it
appears that all programs are executing at the same time.

Multitasking: in an operating system, is allowing a user to
perform more than one computer task (such as the operation
of an application program) at a time. The operating system
is able to keep track of where you are in these tasks and go
from one to the other without losing information

Multithreading: is the ability of a program or an operating
system process to manage its use by more than one user at a
time and to even manage multiple requests by the same user
without having to have multiple copies of the program
running in the computer

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