In a broad sense, the "history" can refer to all the events that occurred in the past, not necessarily linked to human society. In philosophy, the history of this meaning is known as the history of ontology, such as the history of the universe, the history of the earth, birds, history, and so on. The narrow sense of history must be documented based on text appears after the history of what history, before history, called prehistory. History and human society can be called human history or social history, human society from past events is called natural history. In general, the history only the former, namely, social history.
History is not classified in the humanities or social sciences, but meantime the bridge, the merger of two major areas of research methods. Generally speaking, the historian through a variety of written text, but is not confined to this effort and try to answer and history-related issues. Historical knowledge of the raw data is divided into three kinds: written, oral tradition, preserved historical sites, usually historians will study integrated three methods, and written records are often used as emphasis, because it generally records development time. This emphasis gives rise to a new field of prehistory, can also be called the prehistory, of the study is no written record of a period. Vary around the world text appears, so the main difference of the prehistory and history depending on the topic. Scholars for ease of study, according to the scope of past human be divided into different stages. Divided in the past many, including the chronological classification, classified by cultural practices, classified according to different themes. These three categories often overlap, such as "the evolution of the labor movement in Argentina,1930-1945".