Luckrefers to that which happens beyond a person's control. This view incorporates phenomena that are chance happenings, a person's place of birth for example, but where there is no uncertainty involved, or where the uncertainty is irrelevant. Within this framework one can differentiate between three different types of luck:
1. Constitutional luck, that is, luck with factors that cannot be changed. Place of birth and genetic constitution are typical examples.
2. Circumstantial luck, that is, luck with factors that are haphazardly brought on. Accidents and epidemics are typical examples.
3. Ignorance luck, that is, luck with factors one does not know about. Examples can be identified only in hindsight.
Happiness is an emotion associated with feelings ranging from contentment and satisfaction to bliss and intense joy.
A variety of philosophical, religious, psychological and biological approaches have been taken to defining happiness and identifying its sources.
Philosophers and religious thinkers have often defined happiness in terms of living a good life, or flourishing, rather than simply as an emotion. Happiness in this older sense was used to translate the Greek Eudaimonia, and is still used in virtue ethics. In everyday speech today, however, terms such as well-being or quality of life are usually used signify the classical meaning and happiness is reserved for the felt experience or experiences that philosophers historically called pleasure.
Joy is an emotion of great happiness. Joy can also be interpreted as a person's name.