This is a concept about opposite forces that complements themselves. You must notice that inside of yin, there is yang, and inside of yang, there is yin. Yin can also mean something like “black side” and yang something like “white side”. However, a moral dimension is indeed attached to the idea of yin and yang in the philosophy of Dong Zhongshu. The duality of yin and yan is an indivisible whole. Remember that in Taoist metaphysics, the distinctions between good and bad and other dichotomous moral judgments are perceptual, not real. Also, it appears in the pages of I Ching, one of the oldest Chinese classics books. This is part of the primary guideline of traditional Chinese medicine, and is very important to a lot of different forms of Chinese martial arts and exercises, like qigong (Chi Kung), T’ai Chi, baguazhang, and more.
There are many natural dualities that are thought of as physical manifestations of the duality that yin and yang symbolize, like dark and light, fire and water, contracting and expanding. Taoism is a very important philosophical tradition in the entire road, but especially in Asia, and it is recommendable that you study it, if you feel interested. This concept is part of Taoism, also known as Daoism, a spiritual and philosophical tradition born in China many many years ago, most likely somewhere in the 4th century BCE. That is the major difference between both of them. For example, yin could be used to describe bad, and yang could be used to describe good. Yin would be the “negative” part of it and yang the “positive” part of it. Yin and yang are, overall, used to describe opposite or contrary forces. If you want to understand more about yin and yang, keep on reading. There are a lot of ways of understating yin and yang, and a lot of ways of applying this concept in your daily life. The whole concept of yin and yang is very complex since this is a very old concept that has absorbed and inspired a lot of other concepts and cultural works. They are contrary or opposite forces that can be interconnected, and independent, as good and bad is. Yin and Yang can be translated as dark-light or even negative-positive. According to Chinese cosmology, the universe creates itself out of the primary chaos of material energy and is organized into the cycles of Yin and Yang. It got popular around the world due to the yoga culture. Yin and Yang is a concept of dualism that came from Ancient Chinese philosophy.