Autism is a developmental disorder that affects communication and social interaction. Symptoms typically appear before age 3 and vary significantly between individuals. While there is no known single cause, genetic factors and environmental influences both likely play a role. Boys are more likely to be affected than girls. Early diagnosis and treatment that targets social, communication, and behavioral challenges can make a positive difference, though autism has no cure. Therapies aim to help children better interact with others and learn important life skills.