What's the difference between classical Chinese and ancient Chinese?

There is a cross between the two. Ancient poetry mainly refers to ancient poems and essays with a long history and rich cultural connotations in China, such as The Book of Songs and Historical Records. As far as China culture is concerned, it is popular to write poems in the Tang Dynasty, such as quatrains (such as Li Bai's "Early Sending Baidicheng") and regular poems (such as Du Fu's "Landing"); Most popular words in the Song Dynasty have tablet names (such as Bodhisattva Man). The famous word in Yuan Dynasty is Qu (such as Guan Hanqing's Yuan), which has many names of tablets and songs. Classical Chinese is a processed written language based on ancient Chinese. Classical Chinese is an article composed of written language in ancient China, mainly including written language based on spoken language in pre-Qin period. It is characterized by writing based on words, paying attention to the use of allusions, parallel prose, neat melody and no punctuation, including strategy, poetry, words, songs, stereotyped writing, parallel prose and ancient prose.