When we use eBay or any other shopping search engines, set theory is involved. Image Source: Passy’s World of Mathematics In this post we will take a look at several real world uses of Venn Diagrams and Set Theory. They are used in many areas of life where we need to categorize or group items, as well as compare and contrast different items.

Venn Diagrams are diagrams containing circles that show the logical relations between a collection of sets or groups.