Final answer:
The alphabetical list at the end of a book that helps locate specific information is called an index.
Step-by-step explanation:
The alphabetical list at the end of a book that tells you where to find specific information is called an index. This index is usually found in non-electronic versions of texts and allows readers to quickly look up topics or keywords to find the pages where those terms are discussed or referenced throughout the book. An index is different from a bibliography, which is a list of sources and relevant publication details, or a glossary, which provides definitions of terms used in the text.