Define and explain pervasive developmental disorders.

Pervasive Developmental Disorders (PDDs) refer to a group of neurodevelopmental conditions characterized by significant impairments in social interaction, communication, and behavior. These disorders typically emerge in early childhood, often before the age of three, and are lifelong conditions that affect multiple areas of development. The term "pervasive" highlights the fact that these disorders impact various aspects of functioning, rather than being confined to specific areas. PDDs were traditionally used as a collective category for conditions that shared certain core features, but in recent diagnostic classifications, such as the DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition), the term has been largely replaced by more specific diagnoses, such as autism spectrum disorder (ASD).

Historically, PDDs were understood to consist of five specific conditions: Autism, Asperger’s Disorder, Rett’s Disorder, Childhood Disintegrative Disorder (CDD), and PDD-NOS (Pervasive Developmental Disorder-Not Otherwise Specified). These conditions were differentiated based on their severity, the timing of onset, and the particular nature of the developmental delays. However, as understanding of these disorders has evolved, the distinctions between them have blurred, leading to the more unified category of autism spectrum disorder.

### Autism Spectrum Disorder (ASD)
Autism spectrum disorder is the most well-known and commonly diagnosed condition within the umbrella of PDDs. It is characterized by deficits in social communication and interaction, ________ _____ ___ ____ __________.
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