Asperger Syndrome is a term that was previously used to identify high functioning individuals with autism. It's no longer used as a subtype of autism, because all subtypes are now included in the autism spectrum disorder classification.
Now, one with the characteristics of the previously termed Asperger Syndrome, is deemed on the lower end of the spectrum. These individuals have difficulty with social interactions, may have a limited interests and/or have repetitive behaviors. They could also have delayed motor development. They usually do not, however, have significant language delays or difficulties. Some even have amazing vocabularies and understanding of the meanings of words. As with all individuals on the autism spectrum, the strengths and challenges vary greatly from person to person.
A child with Asperger Syndrome is usually not diagnosed until they're having serious difficulties in school or with friends. Adults are often diagnosed when they show signs of significant struggle at work or with their personal relationships and/or are seeking help for depression or anxiety. Both seem to benefit from an understanding of their strengths and challenges, coupled with counseling and social programs that offer an opportunity to develop skills for effective social interactions.