This educational video provides a comprehensive overview of anxiety disorders, distinguishing between normal anxiety and clinical conditions. It specifically breaks down Obsessive-Compulsive Disorder (OCD), Generalized Anxiety Disorder (GAD), Panic Disorder, and Phobias, clarifying the specific diagnostic criteria for each. The host, Hank Green, explains how these disorders are characterized by distressful, persistent anxiety and often dysfunctional behaviors used to reduce that anxiety. The video explores the etiology of these disorders through two main lenses: the Learning Perspective (conditioning, observational learning, and cognition) and the Biological Perspective (genetics, natural selection, and brain chemistry). Key concepts such as stimulus generalization, reinforcement, and the evolutionary basis for fears are discussed to help viewers understand why these disorders persist. For educators, this resource is invaluable for psychology and health curriculums. It actively works to de-stigmatize mental illness by correcting common misuse of terms like "OCD" and "bipolar" in casual conversation. The clear definitions, relatable examples, and engaging animations make complex psychological concepts accessible for high school and early college students, serving as an excellent springboard for discussions on mental health awareness and neurobiology.