A person or device that creates an index, especially for a book or a set of data. The indexer spent several weeks compiling a comprehensive index for the new textbook.
A software program or algorithm that organizes and categorizes data for easy retrieval. The search engine relies on an efficient indexer to quickly provide relevant results to users.
In certain programming languages, a class or struct member that allows object instances to be accessed with array-like index syntax. The class implements an indexer so that its elements can be retrieved using square brackets.