What is love?

I'm sure that far too many people ask this question every day, but i'm oh-so-utterly confused. I am a young person, and it seems like any feelings that we may have are condescended upon by adults, who seem to know the meaning of everything. I'm not trying to say that all young people are really in love when they write things all over their binders and in their profiles, but what if? What if we do fall in love?