What is a hymen?

What is a hymen?
Hope this helps...
"Many people are under the impression that the hymen is located within the vagina. It is not. It’s a mucous membrane that is part of the vulva, the external genital organs. It’s located outside the vagina. The hymen is a layer of tissue, just like the tissue around the opening of your vagina that partially conceals the vaginal orifice. You may or may not have one, most females do. The hymen is not an indicator of virginity; a girl is a virgin until she has been penetrated by a penis."
-Yoga Girl-
be warned: the Wikipedia explanation is pretty graphic. Definitely NSFW!
the thing that covers your punani when you are a virgin (or if it hasn't broken from exercise). Its just a thin cover and once it pops it bleeds.
I'm gonna just let the girls answer that for you but thanks for the points
A thin membrane in the vagina that gets broken during intercourse or vigourous stretching. A lot of people look at it as something that determines your virginity.