a method of visualizing the amount of overlap between two lists of data, using circles to signify the size of each circle and positioning the circles such that the area of overlap represents the amount of list overlap
A Venn diagram is often two circles (can be other shapes) that overlap. The overlapping part usually contains information that is pertinent to the labels on both sides of the Venn diagram. For instance: one circle could be labeled 'Odd Numbers', the other circle could be labeled 'Two Digit Numbers' the overlapping portion must contain numbers that are odd and have two digits. Thus, the overlapping portions shows the relationship between the sets. (Can be more than 2 circles.) [Go to source
visual, graphic representation of the concepts of combining, joining, or rejecting items based on their characteristics or lack of characteristics. Venn diagrams are used to represent the AND, OR, and NOT concepts of Boolean logic.
Venn diagrams are illustrations used in the branch of mathematics known as set theory. They show the mathematical or logical relationship between different groups of things (sets). A Venn diagram shows all the possible logical relations between the sets.