a distribution of the number of times that something can happen in a number of opportunities, when the chance of it happening each time is the same

You can use binomial distribution to determine that likelihood that you will draw an ace from the deck of cards. 你可以用二项分布来确定从扑克牌中抽到一张A的可能性。

The binomial distribution is a mathematical model that can be applied to a huge variety of real life phenomena.