Yin is the partner of Yang in Chinese philosophy. Yin and Yang represent two opposite forces that are interconnected and interdependent in the natural world, and together they create a whole. Yin is characterized as being dark, passive, and feminine, while Yang is bright, active, and masculine. Yin and Yang are often used to describe how opposite or contrary forces are interconnected and interdependent in the natural world, and how they give rise to each other in turn.