Autism, also known as autism spectrum disorder (ASD), is a condition characterized by differences or difficulties in social communication and interaction, a need or strong preference for predictability and routine, sensory processing differences, focused interests, and repetitive behaviors. Characteristics of autism are present from early childhood and the condition typically persists throughout life. Clinically classified as a neurodevelopmental disorder, a formal diagnosis of autism requires professional assessment that the characteristics lead to meaningful challenges in several areas of daily life to a greater extent than expected given a person's age and culture. Motor coordination difficulties are common but not required. Because autism is a spectrum disorder, presentations vary and support needs range from minimal to being non-speaking or needing 24-hour care.