Epilepsy is the nation’s fourth most common neurological disorder, after migraine, stroke, and Alzheimer’s disease; but public understanding of epilepsy is limited. For example, many people do not know the causes of epilepsy or what they should do if they see someone having a seizure. Epilepsy is a complex spectrum of disorders—sometimes called the epilepsies— that affects millions of people in a variety of ways and is characterized by unpredictable seizures that differ in type, cause, and severity. Yet living with epilepsy is about much more than just seizures. For people with epilepsy, the disorder is often defined in practical terms, such as challenges in school, uncertainties about social situations and employment, limitations on driving, and questions about independent living.