Autism Spectrum Disorder (ASD), also known as autism, is a neurodevelopmental disorder characterized by core symptoms including social interaction impairments, communication difficulties, and restricted, repetitive patterns of behavior or interests, typically manifesting before the age of 3. Approximately two-thirds of children exhibit gradual onset during infancy, often accompanied by varying degrees of intellectual disability, sensory processing abnormalities, and other comorbidities. Early intervention during the critical window period is pivotal for improving long-term outcomes.