Autism speaks says " Autism spectrum disorder (ASD) and autism are both general terms for a group of complex disorders of brain development. These disorders are characterized, in varying degrees, by difficulties in social interaction, verbal and nonverbal communication and repetitive behaviors. With the May 2013 publication of the DSM-5 diagnostic manual, all autism disorders were merged into one umbrella diagnosis of ASD. Previously, they were recognized as distinct subtypes, including autistic disorder, childhood disintegrative disorder, pervasive developmental disorder-not otherwise specified (PDD-NOS) and Asperger syndrome" Read more from this website https://www.autismspeaks.org/what-autism
I think the main thing to understand is that the autism spectrum is different for everyone on the spectrum. Like all individuals the person on the spectrum has a lot to offer to this world with some amazing gifts and talents. Hopefully you will be open to learning more.
If you are looking to connect with someone there are many organizations available to help. One of those is the Autism Society. Call 800.328.8476 or visit https://autismsociety.org/