An epilogue is a short section at the end of a story that provides closure for the characters and the reader. It is usually used to tie up loose ends and give the reader a sense of resolution.
One example of an epilogue is the scene at the end of the Harry Potter and the Deathly Hallows, where Harry, Ron, and Hermione are shown 19 years later, sending their own children off to Hogwarts. This epilogue gives the reader a sense of resolution and closure for the characters, as well as providing a glimpse into the future.