Cerebral palsy is a movement or posture disorder. It is caused by brain damage. It affects voluntary muscles, and thus can impair speach and mobility. CP is neither progressive (it doesn't get worse) nor communicable (it's not infections). Cerebral palsy can affect one limb, all four limbs, or any amount of the body in between along a continuum.
Children with cerebral palsy are usually not intellectually impaired, and are thus educated in regular classrooms. However, they may need special devices for mobility and communication. Computers with specialized adaptations are very helpful for students with cerebral palsy.