The Indian government only recognized autism in 2001. Till the 1980s, there were reports that the disorder didn't exist in India. Experts worldwide have estimated that 2-6 children out of every 1000 have autism. In India, currently, 10 million people are suffering.
Autism is a complex developmental disability which starts presenting itself in the first 3 years of a child's life. It is a result of a neurological disorder which affects the normal brain functions of a child, thus eventually affecting their communication (verbal as well as non-verbal) and social skills.
Keep in mind that different children behave differently due to autism; no two children will ever have the exact symptoms. Some may experience mild symptoms while others may experience severe ones.
Social skills: an autistic child will interact in a very different way. If the symptoms in the child are mild, then such people are socially clumsy and awkward, may pass comments which seem offensive to others and may or may not be out of sync with other people of their age group. For those suffering from severe symptoms, they show absolutely no interest in people whatsoever.
Autistic children also find it extremely hard to understand the feelings and emotions of others.
Touch: children with autism have shown dislike to physical contact like being touched, cuddled, hugged etc. However, this is not true for everybody. Many will sometimes hug a parent or a friend, and enjoy that moment of contact greatly.
For children with autism, their social and communicative skills lag behind while their cognitive skills develop quickly enough. Similarly, their language skills might develop rapidly while their motor skills lag behind. For example, they may not be very good at sports, but their vocabulary would be the largest in their age group.