History is the study of past human events and activities. Although this broad discipline has often been classified under either the humanities or the social sciences, it can be seen to be a bridge between them, incorporating methodologies from both fields of study. As a field of study, history encompasses many sub fields and ancillary fields, including chronology, historiography, genealogy, paleography, and cliometrics.
Traditionally, historians have attempted to answer historical questions through the study of written documents, although historical research is not limited merely to these sources. In general, the sources of historical knowledge can be separated into three categories: what is written, what is said, and what is physically preserved, and historians often consult all three. Historians frequently emphasize the importance of written records, which universally date to the development of writing. This emphasis has led to the term prehistory, referring to a time before written sources are available. Since writing emerged at different times throughout the world, the distinction between prehistory and history often depends on the topic.Teaching and Research in institution of higher learning, universities and research institute