What is Dewey decimal system of contrast?

The Dewey Decimal Classification (DDC) is a system used to organize library materials by assigning a unique call number to each item based on its subject. Developed by Melvil Dewey in 1876, the system categorizes knowledge into 10 main classes, each with further subdivisions. The DDC is widely used in libraries around the world to help users locate and access books and other resources.