Answer / manas ranjan nayak

In multi tasking process cpu process more than one job by
switching from one task to another at a time.
In multi programming environment more than one cpu used for
processing.
In multi threading environment more than one cpu are used
and process multiple task at same time.

Answer / nishant bhatt

Multi-tasking is the ability of CPU to handle multiple tasks (JOBS) at same time. Do not think that you need multiprocessor for multitasking.

Multi-Programming is allowing more than one application (that are running in parallel) to use the processing power and resources of a CPU at the same time. ( you don't necessarily need multi processor...One CPU is enough) Note that this is different than multi processing where you must have multiple processors to (Thus, its called multi-processing)

In short, Multi-tasking and Multi-programming means same thing.

Multi-threading is supported by hardware. It is used to increase utilization of a single core (WIKIPEDIA). Parts of program are divided into threads. Note that multithreading is supported only if the applications is multithraded. So if a program is not multithraded then it will not be able to make use of multi threading.

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