Autism is a complex developmental condition that typically appears during early childhood and is characterised by difficulties in social interaction, communication, restricted and repetitive interests and behaviours, and sensory sensitivities. It is called a ‘developmental’ condition because symptoms of autism generally appear in the first two years of a child’s life. It is called a ‘spectrum’ disorder because it is most influenced by different combinations of genetic and environmental factors and affects people differently and to varying degrees. Each autistic person has a set of strengths and challenges that are distinct from any other autistic person and the way (s)he/she learns, thinks or solves problems can range from highly skilled to severely challenged. ASD may occur in persons across all ethnic, racial, and economic groups.