The Venn Diagram

Venn diagrams or set diagrams are diagrams that show all hypothetically possible logical relations between a finite collection of sets (groups).
Venn diagrams were conceived around 1880 by John Venn. They are used in many fields, including set theory, probability, logic, statistics, computer science,
and trying to visit web pages that don't exist.

Also, I have no idea what you were looking for, much less how or why you got here... so here is a bunny with a pancake on its head.