In Chinese philosophy, yin and yang are two opposing forces that are complementary and interdependent. Yin is associated with cold, darkness, water, and the earth. Yang is associated with heat, light, fire, and the sky.
Yin and yang are constantly interacting to create change. When yin and yang are in balance, there is harmony and peace. When yin and yang are out of balance, there is chaos and conflict.
The concept of yin and yang is used in many aspects of Chinese culture, including traditional medicine, acupuncture, and martial arts.