fraternities and sororities are social groups for college students, though sometimes high schools have them too. they exist mostly in the united states and europe. the words "frater" and "soror" are latin for "brother" and "sister" and used to show closeness between members. they also denote whether the group is for men or women. sororities are only for women. fraternities are only for men. but there are some fraternities for women.