A source text can be one of several different things, depending on the context in which the term is used. In literature, it can refer to the original version of a text that has been adapted or translated. Historians use the term to denote a piece of evidence on which a given historical argument depends. For a journalist, a source text is also a piece of evidence, although generally a contemporary one. Additionally, the term can also refer to a block of raw text that is fed into a computer program as input.