What is Love? and How to Love?

Google published the top search queries in 2007, in English, "what is love" is the most hot question in "what is ?" section. Here is the link: http://www.google.cn/rebang/yuedu/2007.htm. Unfortunately, I found that I really don’t know what is love now, who can tell me, what is love? I thought that I know what is love, and what is happiness, and I really do the right thing to get love, love others, and pursuit of happiness, but seems like I lost in the race, I can’t define what is love and what is happiness now. Happiness is not own much money, I have enough money now, but I felt that I lost more things. Happiness is not in a great place, work with great people, I’m working at a best company now, I still felt I’m useless, I made no valuable things ever. Happiness is? I don’t know, I can only give some answer that happiness is not.

Here is an other article that teach you how to love your life: http://howtoloveyourlife.com/dothe/rightthing/main_text.html, I think that many words are useful, although many sentence I’ve used to instruct others, maybe, I’m the real one who most need these.