And as we will see as we build up our understanding of them, not only are they interesting in their own right, but there's a lot of very powerful probability and statistics that we can do based on our understanding of binomial variables. So to make things concrete as quickly as possible, I'll start with a very tangible example of a binomial variable, and then we'll think a little bit more abstractly about what makes it binomial. So let's say that I have a coin. So this is my coin here. Doesn't even have to be a fair coin. Let me just draw this really fast. So that's my coin.