How to understand 'Yin and Yang' in traditional Chinese culture?

Yin and Yang is an important concept in traditional Chinese culture, it is a philosophical idea used to describe opposites and interrelationships in the universe. The philosophy of yin and yang recognizes that the universe is composed of competing and complementary forces of darkness and light, sun and moon, male and female. The yin and yang symbols are related to the ancient methods used to track the movement of the sun, moon and stars throughout the year. Generally speaking, Yin is characterized by inner energy, which is feminine, still, dark and negative. On the other hand, Yang is characterized by outward energy that is masculine, fiery, bright and positive.