Social identity theory is a way of understanding how people view themselves when they feel part of a group. It explains how people's feelings and behavior are influenced by their place in a group. When people feel part of a group, they gain a sense of being special and part of something bigger than themselves. This feeling of belonging can lead people to think and act differently. For example, when people feel part of a group, they may show more loyalty toward the group, be more willing to help members of the group, and be more likely to cooperate with others in the group.