Why we love.Can you tell me?

"Love" is the word which is the main reason why the life is present.Mother starts loving her baby since she feels her in her womb.She goes a lot of pain to give birth to child.Mother loves her child more than any one else in the world would love.After mother it is the father who will take care of the carrier of his child.But the one Love which comes in teenage is the most important love.The love between two teenagers is beautiful.So love is everywhere but the time has to come to reveal it.

First of all, can you define love in your words?

We are mammals, whoese basic characteristic is to Love and get loved.