Well kiddo, a hurdle model is a way to understand how things work when we expect many people to try to do something, but not all of them will actually be able to do it.
Let's imagine we want to know how many kids who like ice cream are able to get their own ice cream cone from the ice cream truck. We know that not all of these kids will be able to get their own ice cream cone because some might not have enough money or some might not be allowed to have ice cream.
So instead of just looking at all the kids who like ice cream, we're going to break them up into two groups: the kids who can get their own ice cream cone and the kids who can't. The kids who can't get their own cone won't be counted in the second part of our analysis because they've already been accounted for in the first part.
This way, we'll be able to get a more accurate understanding of how many kids who like ice cream are actually able to get a cone. We can then use this information to make better decisions about things like how much ice cream to buy or how many ice cream trucks to send out.
So the hurdle model is just a way to break things down into smaller groups when we know that not everyone is going to be able to do the same thing.