Ever seen film of shoppers trying to get through the doors of the shops on black Friday to get the best deals, several hundred people trying to push through a narrow door all at the same time result in it becoming blocked. Well computer servers still do also have a limited capacity for allowing thousands of people through the “doors” at the same time, but if hundreds of thousands of people try to access the same servers at the same time the server also becomes blocked and people can’t get through the doorway.
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