Pervasive Developmental Disorder (PDD) is a term used to describe a group of conditions that affect how a person thinks, interacts, and communicates. It includes disorders like Autism Spectrum Disorder, Asperger's Syndrome, and Childhood Disintegrative Disorder. People with PDD may have challenges in social skills, language development, and behavior, which can make everyday interactions difficult. Early diagnosis and intervention are crucial for helping individuals with PDD. Therapies, such as speech therapy and behavioral therapy, can support their development and improve their quality of life. Understanding and acceptance from family and friends also play a vital role in their journey.