The document describes the closest pair problem in computational geometry. It involves finding the shortest distance between any two points in a set of points in a two-dimensional space. The problem is solved by first sorting the points by their x-coordinates, then recursively dividing the set into halves using a vertical dividing line and solving for the minimum distances in the left and right subsets until single points remain. The minimum distances of the subsets are then used to find the overall closest pair of points between the original sets.