The index is important, because is where you can find more informations about the book. Im not really sure about this answer, but i hope it helped
an index is a thing in the back of a book. The END!
And index is in the back of a story or book.
index is a part of the book that tells you were every thing in the book is
Book Review Index was created in 1965.
An index is located in the back of the book and has a alpabetized list of names and items that can be found in the book with page number to find it. A book index can be created manually by an Indexer, or by using a software like Cindex, PDF Index Generator, etc...
Index books is the plural form.
index
the back of a book
the back of a book
index
index
index