Think about a pool of water.
Now for some reason someone dropped red color into this pool.
Now if you try to get water from this pool it will always be red no matter what you try.
No if you empty the pool and refill it with fresh water you can get rid of the color.
This is (ELI5) what happens if you restart you computer or many other machines. Some data is for some reason in state it should not be and you either have no idea where or how to change it back.
So the restart will flush out all data and refill it with the now (hopefully) correct one.
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