One meaning can be explained when someone tells a joke. If one finds the joke funny, they laugh. This condition of happiness is the most temporary one, for it only lasts a moment. No one will be affected deeply into their emotions by a joke. It is more like a comical relief.
Another way of happiness is when something good happens to someone. Maybe getting a good grade on a test or getting a raise at work. This kind of happiness usually comes from personal accomplishment. One will be happy if they know they