A program can have various threads, which are program parts that run simultaneously. If the computer has a single processor, time will be split among the different threads (perhaps a few milliseconds for one thread or sub-process, a few milliseconds for another, etc.), so that the different threads don't really run simultaneously, but it may seem so. If a computer has multiple processors - quite common with modern processors, such as the Intel I3, I5 or I7 - then the computer will truly run multiple threads at once.
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