I want to know what is the difference between high functioning autism and asperger's syndrome?

Language: The way diagnostic labels are used is not uniform, formally the DX of asperger's is meant to be used when there is no evidence of a language disorder. But in many cases people may get one diagnosis or another just based on where or by whom they are diagnosed. In 2013 with the change of diagnostic manuel to dsm5-most of those people with just be autism spectrum disorder.

In truth, HFA has: never been a separate diagnostic category. The DSM-V diagnosis Autistic Spectrum Disorder ASD) includes Autism, Asperger Syndrome & PDD-NOS because core deficits like absent/diminished theory of mind, impaired facial recognition & lack of joint attention underlie the atypical behaviors in social reciprocity, social communication & narrow, repetitive areas of interest or stereotypies in all types.

AUTISM: Aspergers is no longer a diagnostic category - only Autism Spectrum Disorder.