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Single-processor system has only one actual processor, while Multiprocessor system has more than one, both types of systems can have more than one core per processor.

Multiple processors per system have long been used in systems that need a lot of processing power, like high traffic servers and when lots of computational power is needed. However these systems have been expensive and not needed by normal home or office users.

In recent years it's become typical that one processor has 2, 3, 4 or even 8 cores. These multicore processors behave the same way as if you had multiple processors.

One core can only do one task at a time. Multitasking is done by sharing the time of the processor between processes (program), one process runs for a short time, then another, then another or maybe the first one again. The switching is done so fast that the user wont know the difference. Multiple cores can run multiple processes at once for real.

It depends on your software how well you computer can use the advantage of having multiple processors/cores, dividing the task to different processes.

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