Historical source (also known as historical material or historical data) is original source that contain important historical information. These sources are something that inform us about history at the most basic level, and these sources used as clues in order to study history
Historical sources include documents, artifacts, archaeological sites, features. oral transmissions, stone inscriptions, paintings, recorded sounds, images (photographs, motion picture), and oral history. Even ancient relics and ruins, broadly speaking, are historical sources.
The natural morphological characters, the orographic and hydrographic structures, human interventions, buildings, infrastructures, archaeological finds, are "material sources that illustrate the uses and settlement forms of the past. The literary descriptions, the artistic images, the cartographic testimonies, are verbal or iconic sources able to provide other information, dictated by the historical subject who produced them. The historiographic synthesis project should bring together the different categories of sources, in the effort of a multidisciplinary investigation".