Say it with me: "e-PIS-to-lar-ee"! It's even kind of fun to say and even more fun to read.
Books like Bram Stoker's "Dracula," Stephen King's "Carrie," and parts of the Bible are great examples of epistolary stories. The term "epistolary" comes from "epistles," which are letters.
An epistolary story is written like a series of journal entries, letters,
An epistolary novel often features a series of letters between characters. It can also include journal entries, images/illustrations, newspaper clippings, recordings, radio broadcasts, blog posts, and emails.

The epistolary form can make a story feel more authentic because the text seems to come directly from the characters' lives.
This story is an epistolary parable, a tale that teaches a lesson, often without the student even realizing it.