Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Autism ?
    ### Response:
    Autistic disorder (sometimes called autism or classical ASD) is the most common condition in a group of developmental disorders known as the autism spectrum disorders (ASDs).
                
Autistic children have difficulties with social interaction, display problems with verbal and nonverbal communication, and exhibit repetitive behaviors or narrow, obsessive interests.
    