Autism spectrum disorder (ASD) can make it difficult for those with the condition to interact socially and communicate effectively. People with autism may find it difficult to understand how others feel, which can lead to difficult social situations. They may often find they say the wrong thing because they can't process someone else's emotions. Autistic people can struggle to understand that other people think and feel differently to themselves, and they can often fixate on one topic that interests them without realising it might not interest others.
Autistic children can also use gestures and body language in a different way to most people. They may not smile much, or make proper eye contact. Communication skills can vary, from those with excellent vocabularies to those with no speech at all.