This document discusses book indexing. It defines an index as an ordered arrangement of entries designed to enable users to locate information. Book indexes are created for non-fiction books to provide access to detailed contents. The brief history section outlines how book indexing evolved with increases in book printing and demand for bibliographic access. Indexes serve the purpose of minimizing search time and maximizing success by adding value and increasing document usage. Book indexes will continue to exist as long as books exist, usually found at the back of non-fiction books to aid information retrieval.