Distribution is a discrete probability distribution. One definition is that the probability of success for the first time is only obtained in N Bernoulli experiments. Specifically, it is the probability that n Bernoulli tests fail at the n- 1 and only succeed at the n-th.

For example, the probability of success in an experiment is 0.3. The probability of five successful experiments p = 0.7x0.7x0.7x0.7x0.3.

It is necessary to distinguish geometric distribution from binomial distribution.