Formal:
* Epilogue: A section that comes after the main story, often providing a glimpse into the future of the characters or tying up loose ends.
* Coda: Similar to an epilogue, but shorter and less substantial.
* The End: This is a simple and common way to denote the end of the story.
Informal:
* The last page: A straightforward and literal description.
* The finish: A casual way to say it's over.
* The wrap-up: This implies a conclusion to the story.
The specific term used depends on the context and the type of book. For example, a non-fiction book might not have an epilogue, but it would have a conclusion section summarizing the key points.