Imagine you have a bowl of candy in front of you. You can use one hand to grab a piece of candy and put it in your mouth. You eat the candy and then grab a new piece and put it in your mouth. This way your mouth has to wait for your hand to fetch the next piece of candy, inefficient! It would be faster if you used both of your hands to continuously grab one piece of candy and bring it to your mouth. That way your mouth never has to wait for the next piece.
In this analogy mouth is the core and then hands are the threads.
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