Amazon has a MASSIVE cluster of servers – way more than they need for themselves. They rent them out by the hour to anybody who wants them and is willing to pay. There are a variety of server types, and other network services, under the “AWS” name umbrella.
If you ever thought to yourself, “Oh crap, I need 500 CPUs and graphics cards for a day”, AWS has you covered. For a price of course. Other people just don’t bother with their own servers and 100% rent. It works, as a cost of course.
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