The closest pair of points problem is when you want to find the two points that are closest together out of a set of points. Let's say you have a bunch of dots drawn on a piece of paper. The closest pair of points problem is when you want to find the two dots that are closest together. To solve this, you need to figure out the distance between every two dots and see which two of them have the smallest distance. That way, you'll know which two are the closest together.