This Venn Diagram Example is a diagram that uses circles to depict the relationships between objects or finite groups of things. Circles that overlap share characteristics, whereas circles that do not overlap do not. Venn Diagram Example also aids in visualizing the similarities and differences between two concepts. They have long been acknowledged for their value as educational tools. Since the mid-twentieth century, Venn diagrams have been used as part of the introductory logic curriculum and in elementary-level educational plans worldwide. In the 1880s, English logician John Venn popularised the diagram. He named them after the Swiss mathematician Leonard Euler, who created similar diagrams in the 1700s.