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'Happiness' is the subject of debate on usage and meaning and on possible differences in understanding by culture.

The word is mostly used in relation to two factors:[

 

Happy children playing in water

• the current experience of the feeling of an emotion (affect) such as pleasure or joy, or of a more general sense of 'emotional condition as a whole'.For  instance Daniel Kahneman has defined happiness as "what I experience here and now". This usage is prevalent in dictionary definitions of happiness.

• appraisal of life satisfaction, such as of quality of life. For instance Ruut Veenhoven has defined happiness as "overall appreciation of one's life as-a-whole. Kahneman has said that this is more important to people than current experience.