some quotes...

"Happiness is what happens to us when we try to make someone else happy."
"Happiness is a way of travel -- not a destination"
"Happiness is a warm gun"
"I've learned that everyone wants to live on top of the mountain, but all the happiness and growth occurs while you're climbing it."
"Happiness equals reality minus expectations"
"Happiness is a butterfly, which when pursued, is always just beyond your grasp, but which, if you will sit down quietly, may alight upon you"
"Happiness comes of the capacity to feel deeply, to enjoy simply, to think freely, to risk life, to be needed."

Happiness is the feeling of being loved, respected and understood. Happiness is when you love someone strongly... So loving and being loved is what I would call happiness.