Bullying is considered one of the most prevalent and potentially damaging forms of school violence. Each year, more than a quarter of middle and high school students are subjected to some form of bullying in their school environments. Research has identified potentially harmful immediate and long-term consequences for bullying-involved youth and has linked bullying to the quality of school environments and to unsafe conditions for learning in schools. This "In Brief" focuses on social bullying, a form of emotionally aggressive bullying behavior. The brief includes discussion of how social bullying is defined, what distinguishes it from other types of aggression, how commonly it occurs in schools, and what factors contribute to social bullying involvement. The brief summarizes research findings concerning the impacts of social bullying on individual social development and adjustment and identifies implications for school learning environments. The last section describes school-based approaches for preventing and reducing social bullying.