The term can also be used to refer to digital versions of literary works that are not read in a linear fashion, known as gamebooks, where the reader is instead given choices at different points in the text; these decisions determine the flow and outcome of the story. The most famous example of this form of printed fiction is the "Choose Your Own Adventure" book series, and the collaborative "" format has also been described as a form of interactive fiction. The term "interactive fiction" is sometimes used also to refer to visual novels, a type of interactive narrative software popular in Japan.