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Happiness is when your life fulfills your needs.
In other words, happiness comes when you feel satisfied and fulfilled. Happiness is a feeling of contentment, that life is just as it should be. Perfect happiness, enlightenment, comes when you have all of your needs satisfied.
While the perfect happiness of enlightenment may be hard to achieve, and even harder to maintain, happiness is not an either /or case. There are nearly limitless degrees of happiness between the bliss of enlightenment and the despair of depression. Most of us fall somewhere between, closer to the middle than the edges.
http://happinessinternational.org/what-is-happiness/