In all seriousness, love is an emotion caused by the brain releasing "pleasure" chemicals when you're near that person. It's actually almost the same neurological feeling as eating a great tasting food. This is triggered by physical appearance, intelligence, and scent. (yes, your brain thinks the person's hormonal smell smells good and you don't even realize it.)
An unseen, all encompasing want and desire to be with someone or something, being free from hurt and harm. It is the inborn urge to create a family and propagate mankind. It's different and yet the same for all of us! Boy, was that inadequate!