Classification can refer to the process of organizing and grouping things into categories based on shared characteristics or attributes, and it is used in a variety of fields, including biology, library science, and information science.
In the context of library science, classification refers to the organization of books and other materials according to a set of standardized rules and guidelines, such as the Dewey Decimal Classification system or the Library of Congress Classification system. These systems use a specific set of numbers or letters to represent different subjects or categories, and the books in a library are assigned call numbers based on their classification.
If you are asking about a specific type of classification, it would be helpful to provide more context or clarify the term you are using.