Directories

A book containing an alphabetical or classified listing of names, addresses, and other data, such as telephone numbers, of specific persons, groups, or firms in the health field.Directories containing artistic and alphabetical or classified listing of names, descriptions and keywords, and other data, of specific, groups, or firms.The word directory is used in computing and telephony meaning a repository or database of information. A directory, as opposed to a conventional database, is heavily optimized for reading, with the assumption that data updates are very rare compared to data reads.