In social psychology, a stereotype is an over-generalized belief about a particular category of people. Stereotypes are generalized because one assumes that the stereotype is true for each individual person in the category. While such generalizations may be useful when making quick decisions, they may be erroneous when applied to particular individuals. Stereotypes encourage prejudice and may arise for a number of reasons. In social psychology, a stereotype is an over-generalized belief about a particular category of people. Stereotypes are generalized because one assumes that the stereotype is true for each individual person in the category. While such generalizations may be useful when making quick decisions, they may be erroneous when applied to particular individuals. Stereotypes encourage prejudice and may arise for a number of reasons.