Autism is a complex pervasive developmental disorder that involves the functioning of the brain. It is a neurological disorder and not simply a psychiatric disorder, even though typical characteristics include problems with social relationships and emotional communication, as well as stereotyped patterns of interests, activities and behaviors. It also involves problems with sensory integration. Typically, it appears during the first three years of life. It is estimated that it occurs in approximately 2 to 6 in 1,000 individuals, and is 4 times more prevalent in males than females (source: The Autism Society of America [http://www.autism-society.org/site/PageServer]). It is most prevalent in Caucasian males.

As of 2004, autism is treatable, but not curable (although there is an organization called "Cure Autism Now"). Early diagnosis and intervention are vital to the future development of the child. It is widely considered that cure is impossible, because autism involves aspects of brain structure that are determined very early in development.

From wikipedia - Used with permission