Random numbers are useful for simulations, to create a sense of arbitrariness in games that might make them more “interesting”, i.e. generally speaking: to introduce a level of unpredicatability in the oh-so-deterministic world of today’s computers.
There is an alternative, if you take randomness with a grain of salt: pseudorandomness. This is a technique which generates numbers that appear random and totally unrelated, but are in fact produced by carefully designed algorithmic computations.
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