Euler Diagrams are visual representations used to illustrate the relationships between different sets. They consist of overlapping circles or shapes, where each shape represents a set, and the areas of overlap show how the sets intersect. This makes it easy to see how elements belong to multiple sets or are unique to one. Unlike Venn Diagrams, which typically show all possible intersections among sets, Euler Diagrams focus on the actual relationships present. They are useful in various fields, including mathematics, logic, and computer science, to clarify complex relationships and enhance understanding of set theory concepts.