What is the literary term for a story within story?

The literary term for a story within a story is called a frame story.

This term refers to a narrative structure where an outer story serves as a frame for an inner story. The outer story usually introduces the characters who then tell the inner story, which is often the main focus of the work.

Here are some examples of famous frame stories:

* The Canterbury Tales by Geoffrey Chaucer

* The Arabian Nights

* The Picture of Dorian Gray by Oscar Wilde

* The Princess Bride by William Goldman

* The Life of Pi by Yann Martel

Let me know if you have any other questions!