History: history in a broad sense: the process of material change, which can be divided into two aspects: natural history and human social history. The process of the occurrence and development of human society. History: the study of material changes, referred to as history. Corresponding to the concept of history, history also has broad sense and narrow sense. History in a broad sense: all the sciences in the world can be called history. ("We only know a unique science, and that is the history science." -Marx and Engels) narrow sense history: the study of the development process of past movements in human society. The relationship between history and historiography: history is an objective fact, and there is only one truth. However, the knowledge of recording and studying history often changes, develops and perfects with people's subjective consciousness, and even distorts and fabricates it. Because of this, Hu said, "History is like a little girl. You can dress up as you like." Strictly speaking, the word "history" here should mean history in a narrow sense. Therefore, excellent historians in ancient China paid special attention to "honesty"-"good and evil must be remembered" and "analysis of the truth", which, in layman's terms, means recording facts fairly and objectively and analyzing and judging.