Historical source is an original source that contains important historical information. These sources are something that inform us about history at the most basic level, and are used as clues in order to study history.
Historical sources can include coins, artefacts, monuments, literary sources, documents, artifacts, archaeological sites, features, oral transmissions, stone inscriptions, paintings, recorded sounds, images and oral history. Even ancient relics and ruins, broadly speaking, are historical sources. The types of sources include primary sources, secondary sources and tertiary sources.
Primary source
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".
Secondary source
This type of source generally includes evaluations of primary sources.