ADHD: Attention Deficit Hyperactivity Disorder
ADHD is a neurological disorder that develops during childhood and can persist into adulthood. Although adult ADHD is more common than initially thought, not all children who have these symptoms will go on to have the adult version of the disorder. Childhood symptoms may also change across the lifespan; some fade (e.g., diminished hyperactivity) while others may be expressed differently (e.g., chronic disorganization may result in getting fired from jobs).
This site has a variety of resources about ADHD.