History refers to the study, analysis and understanding of past events and processes. The difference between history and other disciplines is that it has certain object scope, time limit and methods. Specifically, the object of history is the historical events of human society, and the time is limited to a certain stage in the past. The method is to study, investigate and analyze according to objective facts. The purpose of history is to reveal the development law of human social history through the study of the past, provide us with enlightenment and help us better understand the real society and the future.

In the study of history, the media of history is very important. Documents, sites and cultural relics are all sources for historians to understand the past. These media can record people's history, culture, beliefs and technology, but they are often limited by cultural background, political environment and time. Therefore, historians need to study, screen, analyze and correlate this information in order to understand past events more correctly. Historians' work can not be completed simply by reading history books, but must be deeply studied and analyzed.

The importance of history lies not only in its understanding of the past, but also in its guiding role in today's society. Through the understanding of the past society, we can better understand the development of the current society and the background of various cultures, ideas and political concepts. History can also provide us with the possible future development direction, so that we can formulate corresponding policies and strategies in a targeted manner. At the same time, history can also enlighten our way of thinking and judgment, and give us the ability to understand the world more comprehensively and objectively. Therefore, history is a very important subject, which helps to promote the development and progress of human society.