根据给定的英文单词，生成一段描述其意义的自然语言定义。
英文单词：“Happiness”
Happiness refers to a subjective state of positive emotions, contentment, and pleasure. It is a feeling of joy and satisfaction that comes from experiencing something enjoyable, fulfilling or meaningful. Happiness can be derived from both external sources, such as personal achievements and relationships, as well as internal states, such as peace of mind and self-acceptance. It is a fundamental human desire and a key component to overall well-being and life satisfaction.