Index (publishing)

An index is a detailed list of information in a printed publication. This information can include names of people, places, things, events, or ideas that a reader may want to find. Next to each name is a page number. 
In a printed book, the index is found at the end. It should not be mixed up with the table of contents, which is placed near the beginning of the book. The table of contents gives the order of chapters within the book. The index is different from the table of contents because it gives the page location of detailed information within the book. 
The words in an index are given in alphabetical order, first words beginning with A, then with B, then with C, and so forth.
Indexing as we know it today had to grow over the long time of history. It depended on the invention of the alphabet. It depended on the invention of the book (or codex, at first). And, as we have it today, it depended on the invention of the printed book. Gutenberg's printing press of around 1440 made this possible. The first printed index is found in St. Augustine's "De arte praedicandi". This book was made in the early 1460s in Mainz, Germany by the printers of the Gutenberg bible.