Prejudice is a fixed opinion about a person or group formed before knowing them. It is often based on ideas about race, religion, gender, or nationality. Prejudice can appear in many societies.

A person may assume something about another group without meeting individuals from that group. These ideas can be shared through language, media, or traditions. Prejudice can appear in speech, behavior, or decision-making.

Prejudice is connected to stereotypes and discrimination. It is studied in history and social science.