Asperger's syndrome (AS) is an autism spectrum disorder (ASD) marked by impaired social interactions and limited repetitive patterns of behavior, interests, and activities. Individuals with ASD have symptoms that fall on a continuum—and since Asperger's syndrome is now a part of ASD it is commonly believed that individuals with Asperger's syndrome have high functioning ASD. This syndrome has no significant delays of language acquisition, but motor skills may be delayed.
It's conservatively estimated that two out of every 10,000 children have the disorder. Boys are far more likely than girls to be diagnosed with AS, but this could be because girls with AS are often overlooked or misdiagnosed.