Autism 

Autism, or autism spectrum disorder (ASD), refers to a broad range of conditions characterized by challenges with social skills, repetitive behaviors, speech and nonverbal communication.

What that means : someone with ASD 
May struggle with social situations and lack the understanding of social environments . 
To recieve a diagnosis ..the areas that are looked at include social imagination , social interaction and social communication .

along side these difficulties there  are many positives as such individuals quite  often learn and think in a different way ... creating a interesting perspective and thinking out side the box approach