Autism is a complex neurobiological disorder that typically lasts throughout a person's lifetime. People with ASD have difficulties with social and communication skills, which are often accompanied by behavioural challenges. Many people with ASD also have unusual ways of learning, paying attention, or reacting to sensations. It is part of a group of disorders known as Autism Spectrum Disorders (ASD). In most cases its causes are unknown. Today, 1 in 100 individuals is diagnosed with autism.