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Cursive script is a font of Chinese characters, which can be divided into broad sense and narrow sense. In a broad sense, regardless of the age, all scribbled words are regarded as cursive. Narrow sense, that is, as a specific font, was formed in the Han Dynasty and evolved on the basis of official script in order to write simply.
About from the Eastern Jin Dynasty, in order to distinguish it from the new cursive script at that time. The cursive script of the Han Dynasty was called Cao Zhang. The new cursive script is relatively called today's grass, which is divided into big grass (also called crazy grass) and small grass. It feels beautiful in madness. As Li Zhimin said: "Close to the pool, consider the reason, get the heart from things, realize the image, and then enter the beauty of cursive script."
Because cursive script is too simple and easy to be confused with each other, it can't replace official script, and it becomes the main font just like official script replaces seal script.