OK, so im on facebook, and i get invited to some event, about autism, im like, fuck that, im to young to go anywhere on my own(other than the mall and shit with friends) then i see that the description says my friends name in it, and was started by his mother, and there's a website link, and then there is a whole page telling a story about my friend having autism, and i still have no clue what it is, he always seemed normal to me, ive known him most of my whole life, so, because Wikipedia sucks, can someone explain to me what autism is, so i can better understand what my friends been going through?