You may have heard it a couple of times, you may have read or watched a movie about it but you may have not really have given a serious thought as to what is ADHD actually. Attention Deficit Hyperactivity Disorder or more popularly known as ADHD is not a disease, as most people would think, but actually a neurobehavioral condition. In the United States alone, about 5 million children are affected with ADHD. This is for real but the good news is that, it can be treated. The symptoms of ADHD can be categorized into three basic subtypes. These are the inattentive, the hyperactive/impulsive behavior, and lastly, the combination of both.