A book feature is an element of a book that helps to make it more useful and attractive. The PAGE is the sheet of paper that contains the text of the book. An INDEX is an alphabetical list of topics found in the book, usually located at the end of the book. The SPINE is the outer edge of the book that runs along the back and holds the pages together. An APPENDIX is an additional section of a book that provides supplemental information. The COVER is the protective outer layer of the book that usually displays the TITLE. The TITLE is the name of the book that is printed on the COVER.