Answer this question to the best of your ability:
What are the different types of autism spectrum disorder?
Autism Spectrum Disorder (ASD) encompasses a wide range of conditions characterized by challenges with social interaction, communication, and repetitive or restricted behaviors. The types of ASD can vary in severity and can present differently in each individual. The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) combines several previously distinct diagnoses under the umbrella of Autism Spectrum Disorder. These may include:

1. Autistic Disorder: This is the classic form of autism, characterized by significant difficulties in social interaction, communication, and repetitive or restricted behaviors. It's often associated with intellectual disability.
2. Asperger Syndrome: Individuals with Asperger Syndrome typically have milder symptoms than those with Autistic Disorder. They usually have normal or above-average intelligence, but may struggle significantly with social interaction and repetitive behaviors.
3. Childhood Disintegrative Disorder (CDD): This is a rare form of autism where children appear to develop normally until around the age of two or three, after which they lose previously acquired skills in several areas, including speech and social skills.
4. Pervasive Developmental Disorder Not Otherwise Specified (PDD-NOS): This category is used when symptoms suggest ASD but do not meet the full criteria for Autistic Disorder or Asperger Syndrome.

Understanding these different types can help professionals tailor interventions and support to better address individual needs.