A ghost character, in the bibliographic or scholarly study of texts of dramatic literature, is a term for an inadvertent error committed by the playwright in the act of writing. It is a character who is mentioned as appearing on stage, but who does not do anything, and who seems to have no purpose. As Kristian Smidt put it, they are characters that are "introduced in stage directions or briefly mentioned in dialogue who have no speaking parts and do not otherwise manifest their presence". It is generally interpreted as an author's mistake, indicative of an unresolved revision to the text. If the character was intended to appear and say nothing, it is assumed this would be made clear in the playscript.