Rooted in the binary opposition and unity of Yin-Yang, it constructs a symbolic system of hexagrams and lines. Its core philosophy is Change, emphasizing dynamic development and transformation. It integrates Image, Number, Principle, and Divination holistically. It reflects a cosmic view of "Heaven-Human Unity." It serves as both a practical guide for decision-making and a source for self-cultivation. Its terse texts allow rich interpretations, earning it the title "Classic of Classics" and profoundly shaping traditional Chinese thought.