
Traditionally, yin is dark, passive, feminine, cold and negative; yang is light, active, male, warm and positive. Another simpler way of looking at yin and yang is that there are two sides to everything - happy and sad, tired and energetic, cold and hot. Yin and yang are the opposites that make the whole. They cannot exist without each other and nothing is ever completely one or the other. There are varying degrees of each within everything and everybody. The tai chi symbol, shown above, illustrates how they flow into each other with a little yin always within yang and a little yang always within yin. In the world, sun and fire are yang, while earth and water are yin. Life is possible only because of the interplay between these forces. All of these forces are required for the life to exist. See the table below to understand the relationship between yin and yang.
The yin and yang is like a candle. Yin represents the wax in the candle. The flame represents the yang. Yin (wax) nourishes and supports the yang (flame). Flame needs the wax for its existence. Yang consumes yin and, in the process, burns brightly. When the wax (yin) is gone, the flame is gone too. Ying is also gone at that time. So, one can see how yin and yang depend on each other for their existence. You cannot have one without the other.
The body, mind and emotions are all subject to the influences of yin and yang. When the two opposing forces are in balance we feel good, but if one force dominates the other, it brings about an imbalance that can result in ill health.