What is a prequel to a book?

A prequel is a work that takes place before the events of the original book. It can provide background information on characters, events, or settings that were mentioned in the original book. Prequels can offer readers a deeper understanding and insight into the world created by the author and can also expand on the themes and ideas presented in the original work. They are often used to explore the origins of key characters or to delve into the history of a particular place or society. Overall, prequels can add more depth and complexity to a story, serving as a companion piece to the original book.