So what's a Venn Diagram? Why does Kamala like them?

Kamala Harris: I Love Venn Diagrams, You Know …The Three Circles?

 Venn Diagram - Overview, Symbols, Examples  "A Venn diagram is a schematic representation of the elements in a set or a group. It is a diagram that shows all the possible logical relationships between a finite assemblage of sets or groups. It is also referred to as a set diagram or logic diagram.". . .