Discrimination  is when  you're not allowed to do   something because of you age, religion, gender, race. So like if somebody said you couldn't eat at a restaurant because your black that ,would be race discriminateion. People discriminate because they don't think difference is a good thing. They think people that are different either threaten them (make them fell like their better than  others) or think there so much better that they don't think they deserve to do any thing other people .