The computer uses all the cores to execute your running applications. The more cores the more that can be run in parallel.
Picture your computer like a grocery store. Your applications are tasks like shoppers queueing up at the checkout to execute. Some task are simple (not much in the cart), others are more complex (more in the cart). If there is only one cashier then shoppers (tasks) get backed up waiting. If there are multiple cashiers then they can unload (schedule) more shoppers and there is no backup and no applications wait very long for their task to execute.
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