Cursive script, or caoshu, is perhaps the most unrestrained and expressive form of Chinese calligraphy, characterized by its dynamic flow, abbreviated forms, and emphasis on personal expression. This essay will introduce the foundational aspects of caoshu, focusing on its departure from the more structured styles of regular and running script. We will explore how caoshu prioritizes the calligrapher's personal rhythm and emotional energy over strict adherence to traditional forms. This introduction will set the stage for a detailed exploration of its techniques and aesthetics.