Love seems so easy to understand but the truth is, it is intricate in it self. We have wrote countless poems, songs, and books -- all to describe love, but even in that much effort, we are not able to define it absolutely. It is as complex as life it self and we can only see it in fragments. And although we might have relative opinions about it, we can all agree that it is a necessity in life.
As the song suggests, "love will keep us alive" -- and it's true, love is the key to survival. This is a part of the nature of man and other animals. First it makes us feel attached to something or someone, then it pushes us to strive for that thing or person that we love.
Biologically speaking, love is a mechanism for the survival of the species. How is that so? Well, love increases the urgency for mating and it keeps the offspring alive by making us feel attached and obliged to protect them.
But is love merely electrochemical signals in the brain and nothing more? According Clarence Lehman, CBS Dean's Office and Ecology, Evolution and Behavior, Love has its own independent existence, its own claim on the structure of the universe that minds alien to our own would discover and apply it as we do. He adds, "On this Valentine's Day, let us contemplate the independent existence of love."