TLDR
Prenorandom number generators (PRNGs) are a category of algorithms that programmatically generate new random numbers from a given starting value called the seed. These algorithms are not without their own limitations. PRNGs are faster than TRNGs and are not periodic. They are extremely useful in situations involving modeling and simulations as it allows you to “replay” a series of random events by initializing your random number generator with the same seed. In situations where the randomness of the random numbers is critical, we use “true” random numbers.via the TL;DR App
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