Watermelon stereotype: Black people seem to like watermelons. Postcard from 1911.

The First Thanksgiving 1621, oil on canvas by Jean Leon Gerome Ferris (1899). The painting shows common misconceptions about the event: Pilgrims did not wear such outfits, and the Wampanoag are dressed in the style of Native Americans from the Great Plains.

A stereotype is a mistaken idea or belief many people have about a thing or group that is based upon how they look on the outside, which may be untrue or only partly true. Stereotyping people is usually considered a type of prejudice because how a person would appear on the outside is a small part of who a person is on the inside. Like other untrue opinions, stereotypes might be used as reasons to discriminate against another person, or sometimes for a humorous effect in fiction.