I guess...it used to mark a young lady's "presentation" to adult society. Now I think it's more of a tradition than anything else. There are some earlier posts in this thread that explain debutantes really well. I wasn't one, so I can't really explain it. But my roommate my freshman year at Georgia was a debutante. I was like "People still do this?" when she told me. She didn't think it was a big deal at all. But her dad was a doctor in North Carolina and I was just a middle class Yankee, so what did I know!