1.1. What Is a Directory?

A directory is a collection of information about objects arranged in some order that gives details about each object. Popular examples are a city telephone directory and a library card catalog. For a telephone directory, the objects listed are people; the names are arranged alphabetically, and the details given about each person typically include an address and telephone number. Books in a library card catalog are ordered by author or by title, and information such as the ISBN number of the book and other publication information is also contained.

In computer terms, a directory is a specialized database, also called a data repository, that stores typed and ordered information about objects. A particular directory might ...

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