Send documents by express mail. Generally speaking, archives refer to various forms of original records with preservation value directly formed by people in various social activities. The original record is its essential attribute. At present, the academic definition of archives is not uniform.

China ancient archives have different titles in different dynasties. Shang dynasty called it a book, Zhou dynasty called it a clock, Qin and Han dynasties called it an ancient book, and Han and Wei dynasties later called it a document, a copy, a file and a book. After the Qing dynasty, it was often called "file", but now it is unified as "file".