Main difference between multiprogramming and time sharing is that multiprogramming is the effective utilization of CPU time, by allowing several programs to use the CPU at the same time but time sharing is the sharing of a computing facility by several users that want to use the same facility at the same time. Each user on a time sharing system gets her own terminal and gets the feeling that she is using the CPU alone. Actually, time sharing systems use the concept of multiprogramming to share the CPU time between multiple users at the same time.
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