A phone book is a printed or digital directory that lists the names, addresses, and phone numbers of individuals and businesses in a specific area. It is organized alphabetically, making it easy for users to find contact information. Phone books were once essential for communication before the rise of the internet and mobile phones. In addition to personal listings, a phone book often includes advertisements and information about local services. Many regions have transitioned to online directories, but traditional phone books are still used in some places. They serve as a valuable resource for finding contact details quickly and efficiently.