What is love?

Search the Bible cover to cover and you are bound to find one mention of it or another. But, just what is it? Some liken it to a romantic notion: two people get married because they are in love. Love is supposed to conquer all; some find that offensive because love is not a conqueror, but the end of all means. Then, of course, there is that line from that classic movie, Love Story: "Love means never having to say you're sorry."