Autism is a developmental disability that affects communication and social skills and is generally diagnosed before age 3. It is caused by biological factors affecting the brain and is considered a spectrum disorder. Boys are more likely to be affected than girls, with estimates of 2 in 1,000 children being diagnosed. Core symptoms include difficulties with communication, social interactions, and repetitive or restrictive behaviors. Providing a structured routine, clear communication, and a calm environment can help accommodate students with autism.