All modern computers have hardware in the processor that makes random numbers. It’s usually based on quantum effects – small changes of current across a piece of wire.
Then they use that random data to mix it up with all the things others have mentioned. When done right it’s truly random and secure.
And some more expansions is required on:
> Random is that which is unpredictable.
You can shuffle a deck of cards and then give it several more people to shuffle. It was a process that and if you’ve recorded it carefully you could reconstruct it. But for someone you give that deck of cards the order is unpredictable. Is it random according to your definition?
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