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An index is a list of words or phrases and the corresponding page numbers where those words or phrases can be found in a book, document, or other text. An index is typically found at the end of a book or document and is used to help readers find specific information quickly and easily. An index may also include cross-references, which are references to other places in the text where related or additional information can be found.

In addition to being a useful tool for readers, an index can also be an important part of the writing process. When creating an index, writers must carefully review their work and identify the key concepts and terms that are discussed in the text. They must then decide how these concepts and terms should be organized and listed in the index. This process can help writers clarify their own thinking about the content of their work and make it easier for readers to understand and follow the argument or discussion.