A phone directory is a printed or digital list that contains the names, addresses, and phone numbers of individuals and businesses within a specific area. It serves as a reference tool for people looking to contact others, making it easier to find phone numbers without needing to search online. Phone directories can be organized alphabetically or by category, such as residential or business listings. Many modern directories are available online, allowing users to search for information quickly. Some directories also include additional features, such as maps or links to websites, enhancing their usefulness for finding contact information.