An "out-group" refers to a social group that an individual does not identify with or belong to. This term is often used in psychology and sociology to describe people who are perceived as different from one's own group, known as the "in-group." Out-groups can be based on various factors, including ethnicity, religion, or social status. The concept of out-groups can lead to biases and stereotypes, as individuals may view members of out-groups through a lens of misunderstanding or prejudice. This can affect social dynamics and relationships, influencing how people interact with others, including those from different cultures or communities.