Index

Index is a term used in various fields with different meanings. In general, an index is a tool that helps to locate information or measure changes. This article will focus on the most common uses of the term in mathematics, computing, and publishing.

Mathematics

In mathematics, an index refers to an exponent or other superscript or subscript number attached to a base number. It is used in powers, roots, and logarithms, where it denotes the power to which a number is raised.

Computing

In computing, an index is a data structure that improves the speed of data retrieval operations on a database table. Indexes are used to quickly locate data without having to search every row in a database table every time a database table is accessed. Indexes can be created using one or more columns of a database table, providing the basis for both rapid random lookups and efficient access of ordered records.

Publishing

In publishing, an index is a list, usually at the end of a publication, that provides references to the pages where specific information can be found. The items in the index are usually sorted alphabetically and they can include names, subjects, places, events, and other categories. The purpose of an index is to guide the reader to the parts of the book where the topics of interest are discussed.

See also

• Index (disambiguation)
• Indexing (disambiguation)