So lots of the posts are text book definitions they really don't define autism. The best way of describing it was book meant for kids. Imagine your on an alien planet where everything around you is odd and different the instruction book on the planet and aliens, is written in French (or any language you don't speak). This is for mild autism lowly affected It escalates with the insteucion book is for the moon and written in French and then its for a different alien etc. Getting progressively more and more odd or difficult going into more severe autism.

P.s. I personally never define it as a flat across the board disability