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Concurrent computing describes a process where multiple programs or threads are managed by one computing system through the process of alternating timeshared slices.
In many of these systems, it can appear that processes are being executed in parallel, but concurrent processes are little bit different than parallel computing.
The traditional term parallel computing refers to executing different programs at the same precise instant through the use of multicore or multiprocessor designs.
By contrast, concurrent computing develops a system where pieces of each procedure are queued together and share a rotating focus on the part of the single processor.
This provides a key alternative for systems that want to imitate parallel processing without building multicore designs.