This document defines and discusses stereotypes. It notes that stereotypes are oversimplified generalizations about groups of people. They often evolve from a lack of exposure or understanding of other groups. Stereotypes can be implicit or explicit. While stereotypes can help process information efficiently, they can also be unfair and persist despite changes to the groups. The document examines types of stereotypes like ethnic, gender, and positive/negative stereotypes. It explores the differences between stereotypes, attitudes, and prejudices.