What is love?!?

I kind of like this song by Fan Fan. Do I really love him? is the emphasis of this song. But to me, I think I would like to ask myself do I know what is love? If love at first sight, true? Is what kind of attention you receive and give determine if the person love you or you love him? I don't really know how to answer. I have been in love at first sight before but do I really love him or is it temporary attraction.