Bystander intervention refers to the act of individuals stepping in to help prevent or intervene in a situation where someone is at risk of harm or in need of assistance. This research area explores the psychological, social, and situational factors that influence bystander behavior, including why some people are more likely to intervene than others. It also investigates the effectiveness of bystander intervention programs and strategies for increasing bystander willingness to help in various situations, such as instances of bullying, sexual assault, or emergency situations.