Love involves looking at someone subjectively instead of objectively. It asks of me to give my heart to another regardless of whether that person has earned it. In fact, I become willing to overlook the negatives about someone in order to be smitten. I give my heart because I want to be attached to that person. I want to belong to (and with) that individual, and I want that individual to belong to (and with) me.
This love could be romantic and passionate (such as between spouses and lovers). It could be that I have your best interests at heart, treat you lovingly, help you learn and grow, and I protect you to the best of my ability (such as with a child). It could be that I take a great interest and pleasure in nurturing and caring for you, and being good to you (such as with a pet or a friend).