How do groups contribute to one's self-esteem?

By enhancing one's self-concept

1. Self-esteem: Groups contribute to individuals' feelings of self-worth and establish a positive social identity. Belonging to prestigious or valued groups enhances one's self-concept.
2. Satisfaction of psychological and social needs: Groups satisfy social and psychological needs, such as a sense of belonging, giving and receiving attention, love, and power within the group.