Autism spectrum disorders (ASDs) is a broad term used for a wide range of neurodevelopmental disorders. Individuals that have ASD display restricted and repetitive patterns of interests or behavior, and experience difficulties with social interaction and communication. Many children are not diagnosed with the symptoms of ASD until they are older. The severity of symptoms varies in autism spectrum disorders. Mildly affected people experience some difficulty and are able to function independently. Those who have moderate to severe symptoms need more support in their lives. The exact cause of ASDs is not known but the risk factors may involve genetic conditions, a family history of autism and having an older parent. The objective of this book is to give a general view of the autism spectrum disorders. It provides significant information of this discipline to help develop a good understanding of the pathogenesis and diagnosis of autism spectrum disorders. This book will prove to be immensely beneficial to students and researchers in this field.