Oppositional Defiant Disorder (ODD) is characterized by frequent and consistent periods of irritation or argumentation toward authority figures that typically begins in preschool years. The DSM-5 lists symptoms including angry/irritable mood, argumentative/defiant behavior, and vindictiveness that negatively impact work, school, or family and last at least 6 months. There is no single cause identified but potential factors include genetics, parenting styles, brain chemistry, and social environment. Treatment focuses on therapy and training for both the child and parents to improve communication and behavior through techniques like parent training and cognitive training.