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Autism spectrum disorder[a] (ASD), or simply autism, is a neurodevelopmental disorder "characterized by persistent deficits in social communication and social interaction across multiple contexts" and "restricted, repetitive patterns of behavior, interests, or activities".[11] Sensory abnormalities are also included in the diagnostic manuals. Common associated traits such as motor coordination impairment are typical of the condition but not required for diagnosis. A formal diagnosis requires that symptoms cause significant impairment in multiple functional domains; in addition, the symptoms must be atypical or excessive for the person's age and sociocultural context.[12][13]

Autism is a spectrum, meaning it manifests in various ways, with its severity and support needs varying widely across different autistic people.[12][13][14] For example, some autistic people are nonverbal, while others have proficient spoken language. Furthermore, the spectrum is multi-dimensional and not all dimensions have been identified as of 2024.[15][16]

Public health authorities and guideline developers classify autism as a neurodevelopmental disorder,[12][17][13][18][19] but the autism rights movement (and some researchers) disagree with the classification. From the latter point of view, autistic people may be diagnosed with a disability, but that disability may be rooted in the structures of a society rather than the person.[20][21][22] On the contrary, other scientists argue that autism impairs functioning in many ways that are inherent to the disorder itself and unrelated to society.[23][24] The neurodiversity perspective has led to significant controversy among those who are autistic and advocates, practitioners, and charities.[25][26]