Bullying interferes with learning and takes many forms such as teasing, assault, and harassment. It negatively impacts victims, bystanders, and bullies. Victims experience fear, loss of self-esteem, depression, and lower academic performance. Bystanders also feel fear and guilt. Bullies are more likely to drop out of school and engage in criminal behavior. Teachers should establish zero tolerance for bullying, closely supervise areas where it often occurs, and act immediately to address reported incidents.