A diagram that uses overlapping rings or circles to represent sets and their relationships.
The vending (venn) machine only gives out rings.
The red section applies to only A and the blue section applies to only B but where the two rings overlap applies to both A and B.
Venn diagrams can have any number of rings or circles.
The centre of the above venn diagram where all 3 rings overlap represents the product that is made fast, cheap and good.