what is an appendix in a book

An appendix in a book is a section located at the back of a book that includes any additional or supplementary information on the books topic, such as references, citations, or bonus material that doesn't make it into the main body of the book. Not every book has an appendix page, and it is more often used in nonfiction books, such as biographies, autobiographies, research-based books, and cultural critiques. The specifics of the information included in an appendix will depend entirely on the type of book. If a book has an appendix, it is there to provide extra information about the story or topic and to help readers better understand the work and the research behind it. An appendix will always go at the back of the book, before other back matter.