Answer Posted / raghavendra sharma

Multi-tasking:it is nothing but a single system with one
processor performs execution of more than one process.

Multi-user:multi-user may be defined as using of same
process or program by no of users at a single unit of
time.EX:when we consider google database it is accessed by
millions of users at a time from different parts of world.

Multi-processing:multi-processsing is a special technique
in which a single system consists of more than one
processors and each process is done by all the processors.
Advantage:Each process is executed in very small amount of
time.
Disadvantage:It is very costly process.

Time-sharing:time-sharing is a process in which if there
exists more than one process each process is executed by
giving certain amount of time after that time control is
switched to next process and vice-versa.
Advantage:all process are executed simultaneously.
Disadvantage:it takes lot of time to execute all processes.

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