Autism is a life-long developmental disability.
This means that it impairs various aspects of typical development and lasts a lifetime. Autism is a syndrome, which means that it is a condition defined by the existence of a collection of characteristics. The most outstanding hallmark of autism is difficulty with reciprocal social interaction. This can range from appearing to want social isolation to experiencing social awkwardness in attaining and maintaining ongoing relationships. The symptoms of autism are usually apparent within the first 36 months of life.