In Eastern philosophy, it is the principle that all existence and phenomena in the universe are composed of two opposing forces, Eum and Yang, which harmonize and balance each other to create change.
Eum is considered to have dark, cold, internal, and passive qualities, while Yang is considered to have bright, hot, external, and active qualities.
These two forces are interdependent, relative, and constantly changing, forming and harmonizing all things in the universe.