Book is an ancient applied literary style, also known as what

that is, letters, the ancient letters, also known as "shakuji" or "letter", is an applied style of writing, more than a record of the case of Chenfei. Ancient China's lyrical prose began with letters. Han, Wei and six dynasties of the literati's letter focus on practical, not written into an aesthetic work. After the Tang and Song dynasties, in the pen of some literati, the practical function of the letter is obviously diluted, the aesthetic consciousness is increasingly strengthened, some of the letter deliberately written as a purely literary works. Ruler literary function is diverse, can be lyrical, such as Sima Qian's "report Renan book", Lin Jumin's "and his wife's book"; can also write the scene, such as Wu Jun's "and Song Yuansi book"; can be written privatization of events and feelings, such as Jikang's "and the mountain source of the Book of the end of the book"; can also be into the visit to the noble and encouraging the later school, the formation of a distinctive letter writing tradition. Ruling and other styles of writing, also pay attention to the layout, the quality of the text is good. In addition, the letter is not necessarily marked with the word "book", such as Su Shi's "answer Qin Taixu".