A Venn diagram is a diagram that shows all possible logical relations between a finite collection of sets. This template consists of four circles, each representing one set. The first circle labeled Set A represents the set of all people in the world. The second circle labeled Set B represents the set of all people who are not in Set A. The third circle labeled Set C represents the set of all people who are not in Set B and finally, the fourth circle labeled Set D represents the set of all people who are not in Sets A, B, and C.