Attention deficit hyperactivity disorder, commonly known as ADHD, is a neurodevelopmental disorder that is characterized by hyperactivity, impulsivity, and inattention. Some common synonyms for ADHD include hyperkinetic disorder, attention deficit disorder (ADD), and childhood-onset disorder. Hyperkinetic disorder is used to describe the hyperactivity and impulsivity symptoms of ADHD, while ADD is used to describe the inattention symptoms. Childhood-onset disorder is often used to emphasize that ADHD typically begins in childhood and can persist into adulthood. Other related terms include executive function disorder, which refers to difficulties with organization, planning, and decision-making, and developmental coordination disorder, which refers to difficulties with motor coordination.