Traditional literature is the term used to describe various forms of folklore, stories that come from the oral tradition. They do not have a known originating author, but have been collected and retold by people like the Grimm Brothers. Traditional literature includes folktales, mythology, legends, tall tales, folk songs, nursery rhymes and fairy tales. Fairy tales by known originating authors, such as those by Hans Christian Andersen, are not traditional literature. Folklore may appear as a single illustrated story in picture book format, or a number of stories may be collected into an anthology.