ADHD is a clinical condition characterized by inattention, hyperactivity, and impulsiveness. It affects 3-5% of school-aged children, with boys being affected more often than girls. Symptoms must be present before age 7 and occur in more than one setting, like home and school. While medication can help, it is not appropriate for every child with ADHD and has potential side effects. Non-medication strategies teachers can use include keeping students close, providing movement breaks, giving clear instructions, and maintaining routines and parent communication.