A set of stories nested inside another story is referred to as a?

A set of stories nested inside another story is referred to as a frame story, also known as a story within a story or embedded narrative.

Here's a breakdown:

* Frame story: The overarching narrative that provides the context for the nested stories.

* Embedded narratives: The stories within the frame story, often told by characters within the frame story.

This structure allows for multiple perspectives, themes, and levels of storytelling, adding depth and complexity to the overall narrative.

Some famous examples of frame stories include:

* The Canterbury Tales: A group of pilgrims tell stories to pass the time on their journey.

* The Arabian Nights: Scheherazade tells stories to the sultan to delay her execution.

* The Princess Bride: The story is told by a grandfather to his sick grandson.

Let me know if you'd like to explore any of these examples in more detail!