Attention Deficit Hyperactivity Disorder (ADHD) is characterized by patterns of inattention and/or hyperactivity-impulsivity that interfere with functioning in multiple settings, affecting about 5% of children globally, with a greater prevalence in boys. The DSM-5 outlines specific diagnostic criteria, including symptom persistence for at least six months and the presence of symptoms in various contexts. ADHD can co-occur with other disorders and is influenced by genetic and environmental factors, with effective educational strategies identified for managing its impact in school settings.