* Index: A list of terms or topics mentioned in a book, along with the page numbers where they appear. It helps readers find specific information quickly.
* Glossary: A list of terms used in the book, along with their definitions. It's especially helpful for technical or specialized books where there may be unfamiliar words.
* Appendix: Supplementary material that expands on the main text, such as charts, tables, questionnaires, or extended discussions.
* Bibliography: A list of sources that the author used to write the book. This is important for academic or research books, allowing readers to explore the sources further.
All of these sections are typically found at the back of the book, after the main text.