Autism, Asperger's, and other similar disorders used to be separate diagnoses, but now all fall under the broader term Autism Spectrum Disorder, which some people still refer to as Autism. It is a brain disorder that limits a person's ability to communicate and relate to other people. It first appears in young children, who fall along a spectrum from mild to severe. Some people can navigate their world, some have exceptional abilities, while others struggle to speak. ASDs affect about one child in 59, striking nearly four times as many boys as girls.