Telephone directory

A telephone directory, commonly called a telephone book, telephone address book or phonebook, is a listing of telephone subscribers in a geographical area or subscribers to services provided by the organization that publishes the directory. Its purpose is to allow the telephone number of a subscriber identified by name and address to be found. It may include a 'yellow pages' section that list businesses by type, architects, beauticians, carpenters, etc., or the Yellow pages may be provided as a separate volume. The slogan "Let Your Fingers Do the Walking", introduced by the Bell System, refers to use of Yellow Pages phone books.

The advent of the Internet, search engines, and smartphones in the 21st century greatly reduced the need for a paper phone book. Some communities, such as Seattle and San Francisco, sought to ban their unsolicited distribution as wasteful, unwanted and harmful to the environment.