Editing Venn diagram (section)

==Example==
[[File:Venn diagram of legs and flying.svg|class=skin-invert-image|thumb|left|Sets of creatures with two legs, and creatures that fly]]
This example involves two sets of creatures, represented as overlapping circles: one circle that represents all types of creatures that have two legs, and another representing creatures that can fly. Each separate type of creature can be imagined as a point somewhere in the diagram. Living creatures that have two legs ''and'' can fly—for example, parrots—are then in both sets, so they correspond to points in the region where the two circles overlap. This overlapping region would only contain those elements (in this example, creatures) that are members of both the set of two-legged creatures and set of flying creatures.

Humans and penguins are bipedal, and so are in the "has two legs" circle, but since they cannot fly, they appear in the part of the that circle that does not overlap with the "can fly" circle. Mosquitoes can fly, but have six, not two, legs, so the point for mosquitoes is in the part of the "can fly" circle that does not overlap with the "has two legs" circle. Creatures that are neither two-legged nor able to fly (for example, whales and spiders) would all be represented by points outside both circles.

The combined region of the two sets is called their ''[[union (set theory)|union]]'', denoted by {{nowrap|A ∪ B}}, where A is the "has two legs" circle and B the "can fly" circle. The union in this case contains all living creatures that either are two-legged or can fly (or both). The region included in both A and B, where the two sets overlap, is called the ''[[intersection (set theory)|intersection]]'' of A and B, denoted by {{nowrap|A ∩ B}}.