A document is a written, drawn, presented, or memorialized representation of thought . The word originates from the Latin documentum, which denotes a "teaching" or " lesson ": the verb doceō denotes "to teach". In the past , the word was usually used to denote a written proof useful as evidence of a truth or fact. In the computer age, " document " usually denotes a primarily textual computer file, including its structure and format, e.g. fonts, colors , and images. Contemporarily, " document " is not defined by its transmission medium, e.g., paper , given the existence of electronic documents. "Documentation" is distinct because it has more denotations than " document ". Documents are also distinguished from "realia", which are three-dimensional objects that would otherwise satisfy the definition of " document " because they memorialize or represent thought ; documents are considered more as 2 dimensional representations.