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  1. What is Autism? - Autism Research Institute

    Autism is a developmental disorder with symptoms that appear within the first three years of life. Its formal diagnostic name is autism spectrum disorder. The word “spectrum” indicates that …

  2. Autism - World Health Organization (WHO)

    Sep 17, 2025 · Autism – also referred to as autism spectrum disorder ̶ constitutes a diverse group of conditions related to development of the brain. In 2021 about 1 in 127 persons had autism. …

  3. Autism - Wikipedia

    Autism is primarily characterized by differences and difficulties in social interaction and communication, alongside restricted or repetitive patterns of interests, activities, or behaviors …

  4. Autism spectrum disorder - Symptoms and causes - Mayo Clinic

    May 22, 2025 · Autism spectrum disorder is a condition related to brain development that affects how people see others and socialize with them. This causes problems in communication and …

  5. What is autism spectrum disorder? - Harvard Health

    May 22, 2025 · Autism is a neurodevelopmental condition that affects a person’s ability to communicate and interact with others, often involving challenges with starting and maintaining …

  6. Autism: Overview - Canada.ca

    Autism (also known as autism spectrum disorder or ASD) is a lifelong neurodevelopmental condition. Autistic people may: Autistic people may also have other physical, intellectual, …

  7. Autism spectrum disorder (ASD) | Autism Speaks

    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.

  8. What is autism? - NHS

    Sep 23, 2025 · Being autistic does not mean you have an illness or disease. It means your brain works in a different way from other people. It's something you're born with. Signs of autism …

  9. About Autism Spectrum Disorder | Autism Spectrum Disorder …

    Apr 14, 2025 · Autism spectrum disorder (ASD) is a developmental disability caused by differences in the brain. Some people with ASD have a known difference, such as a genetic …

  10. Autism | Definition, Symptoms, Neurodevelopment Features,

    Dec 19, 2025 · Autism is a neurodevelopmental difference that affects how a person experiences and interacts with the world. Indications of autism, often observed in physical, social, and …