The question is very trivial, but not everyone knows how to answer, and unfortunately there are so many inaccuracies and clichés about Autistic Disorder.. Autism is a disorder of neurobiological development, it is not a disease.
It is a spectrum of disorders ( autistic spectrum) in which different disorders are included.
Spectrum condition means that everyone shows different levels and characteristics; no autistic experience, therefore, is an autistic experience in the same way.
It is possible to schematize the spectrum as follows:
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Low-functioning autism_______High-functioning autism