The notion of yin-yang, commonly known in the West as (yin and yang), is used in Chinese philosophy to express how polar or seemingly opposing energies are interrelated and interdependent in the natural world, and how they give rise to one another.
As a result, opposites only exist in relation to one another. The concept underpins many branches of classical Chinese science and philosophy, as well as serving as a primary guideline in traditional Chinese medicine and a central principle in various forms of Chinese martial arts and exercise, such as baguazhang, Taijiquan (tai chi), and Qigong (Chi Kung), as well as I Ching divination.
Many natural dualities are regarded to be representations of yin and yang, such as dark and light, female and male, low and high, cold and hot (respectively).