What are the differences between sequential and parallel processing in operating systems?

How do sequential processing and parallel processing each work in the general context of an operating system. When is sequential processing ever used? How exactly does parallel processing go about providing a solution to the limitations of sequential processing? What are the similarities and differences between threads and parallel processes?
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AndyAinscowFreelance programmer / ConsultantCommented:
I'd suggest looking those topics up in wikipedia.org
You would get a lot of information
Mr TorturSystem EngineerCommented:
only with the terms I would say that sequential is one task is processed after the other, and parallel is several tasks processed simultaneously.

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In general context operating system does not do any processing. That is the privilege of user programs.
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