Frame story

A frame story (also known as a frame tale, frame narrative, sandwich narrative, or intercalation) is a literary technique that serves as a companion piece to a story within a story, where an introductory or main narrative sets the stage either for a more emphasized second narrative or for a set of shorter stories. The frame story leads readers from a first story into one or more other stories within it. The frame story may also be used to inform readers about aspects of the secondary narrative(s) that may otherwise be hard to understand. This should not be confused with narrative structure.^[1][2][3] A notable example is The Decameron.