A Class Number is a unique identifier assigned to a specific category or classification within a library or information system. It helps organize and locate materials efficiently, allowing users to find books, articles, and other resources related to a particular subject. Class Numbers are often part of classification systems like the Dewey Decimal System or the Library of Congress Classification. In these systems, each Class Number corresponds to a specific topic, making it easier for librarians and patrons to navigate collections. For example, a Class Number might represent subjects such as history, science, or literature, ensuring that related materials are grouped together for easy access.