Description In Chinese philosophy, the concept of yin-yang (simplified Chinese: ; traditional Chinese: ; pinyin: ynyng), which is often called 'yin and yang', is used to describe how opposite or contrary forces are interconnected and interdependent in the natural world; and, how they give rise to each other as they interrelate to one another. Many natural dualities (such as light and dark, high and low, hot and cold, fire and water, life and death, male and female, sun and moon, and so on) are thought of as physical manifestations of the yin-yang concept.