Pseudorandom
Pseudorandomness is a mathematical concept used to describe the behavior of certain types of algorithms that generate a sequence of numbers that appear to be random. A pseudorandom number generator (PRNG) is a type of algorithm that generates a sequence of numbers that appear to be random.
These algorithms generate a sequence of numbers that, to all intents and purposes, look random. This is done by using a seed, which is a starting point, and then using a set of mathematical operations to generate a new number. This new number becomes the seed for the next number in the sequence, and so on.
The most common type of PRNG is a linear congruential generator, which uses a simple mathematical formula to generate a new number from the previous one.