History: The narrow sense of history is to record and explain the specific process and regularity of the development of human society. History in a broad sense refers to the development process of everything. The definition of history in the relevant literature "The New British Encyclopedia" defines history: This is a discipline that studies the chronological records of events (events that affect the country and the nation). It is based on the textual research of original historical materials and explains the reasons of these events. The definition of "Soviet Encyclopedia" is истори.)1.The development process of any event in nature and society. The history of the universe, the history of the earth, the history of various disciplines-the history of physics, the history of mathematics, the history of law and so on. Can be included in this meaning. 2. Studying the specific and diverse past disciplines of human society aims at explaining the specific present and future prospects of human society. Yin Da's historical definition in The History of the Development of China: History is a discipline that studies and describes human history by using historical materials. It includes the theory and practice that people possess historical materials, understand history, study history and compile history. The etymology of "history" The word "history" and the word "story" come from the Greek word historia, which means "a person's investigation record". Chinese "history" is a compound word composed of two monosyllabic words: calendar and history. Xu Shen's "Shuo Wen Jie Zi" says: calendar, passing away, passing away. History, the recorder also; From the middle, middle and right. Together, these two words mean "an objective record of the past". This is different from the viewpoint of western historiography, which leads Hegel to believe that "China has only records but no history in ancient times". Historians' working methods Historians often use various historical materials, including written records, oral history and archaeological discoveries. After entering the modern society, multimedia materials have also become an important source of historical materials for historians to inspect history. What happened before human records are called prehistory.