Autism is a pervasive developmental disorder that appears in childhood, usually up to the third year of a child's life and affects almost all psychological functions. After we have defined the term, in this paper we will familiarize ourselves with the historical development of the disorder and we will define its criteria. Given that autism is a complex disorder characterized by a certain clinical picture, we will see how there are cases where the symptoms are like those in autism, but the diagnosis is not autism itself. Then we are talking about disorders from the autism spectrum. Therefore, it can be concluded that establishing a diagnosis is a complex process, which is assisted by certain diagnostic criteria, a multidisciplinary team, and the application of measuring instruments. After the diagnosis is made, the focus shifts to finding an appropriate therapy that will enable the inclusion of a person with autism in everyday activities and encourage the development of his abilities and skills. The aim of this paper is to show autism through its peculiarities, not just negative and disturbing symptoms. People with autism should not be seen through their disability and diagnosis, but as equal members of society who should be provided with support and opportunities so that they can function in their daily life.