A Hasse diagram is a graphical representation of a partially ordered set, which helps visualize the relationships between elements. In this diagram, elements are represented as points, and lines connect them to show the order. The diagram is drawn in such a way that if one element is less than another, it appears lower on the diagram. Hasse diagrams are particularly useful in fields like mathematics and computer science for understanding concepts such as lattices and order theory. They simplify complex relationships, making it easier to analyze and interpret the structure of ordered sets.