ADHD (Attention Deficit Hyperactivity Disorder) is a common behavioral disorder affecting about 10% of school-age children, characterized by inattention, hyperactivity, and impulsivity. There are three types of ADHD: predominantly inattentive, predominantly hyperactive-impulsive, and combined, with symptoms that vary accordingly. Treatment often includes medication and psychosocial therapies to manage symptoms, but there is no cure for ADHD.