What kind of book does Zhouyi belong to?

Book of Changes, also known as Book of Changes and Book of Changes, occupies an important position in the treasure house of traditional culture in China. Zhouyi is China's ancient philosophical work, which demonstrates and describes the operating law of things based on the dualism of Yin and Yang. It classifies the characters of all things in the world and heavenly stems and earthly branches's Five Elements Theory, even accurate enough to predict the future development of things.