Bullying involves harmful behaviors that undermine a person's sense of control over themselves and their lives. It is defined by its impact of making the target feel helpless, rather than the intent or persistence of the behavior. Responding to bullying should focus on restoring the target's sense of agency by involving them in decisions and solutions. Labels like "bully" or "victim" should be avoided to prevent self-fulfilling identities and maintain focus on addressing problematic behaviors.