ELI5: Explain Like I'm 5

Random number generation

Random number generation is a way of coming up with a number that is completely random and cannot be guessed. It's like a game of chance. Imagine if you spun a wheel with numbers on it and whichever number the wheel stopped on was the random number. Random number generation is like that, except without the wheel. Instead, special algorithms are used to choose a number that isn't predictable and can't be guessed.