Random numbers is not a very common requirement for modern websites, but it is quite useful and essential. It is a simple way to make things that seem random, but are in fact repeatable. When used to generate unique random numbers, it can generate data with a great variety of distributions like Gaussian, Poisson, Binomial and Exponential.

When a number is generated, the time it takes is independent from the other numbers. With that, it is possible to generate the same number in different ways, and even from different devices, because it has to use the storage of the device.