DDC codes, or Dewey Decimal Classification codes, are a system used in libraries to organize and categorize books and materials. Developed by Melvil Dewey in 1876, this classification system allows for efficient browsing and retrieval of information. Each code represents a specific subject area, making it easier for users to locate resources.

The DDC system is hierarchical, consisting of three main components: the three-digit class number, the decimal number for divisions, and the additional notation for specific topics. For example, the class number 500 represents natural sciences, while 590 is reserved for zoology. Understanding these codes is crucial for librarians, researchers, and students alike.

In today's digital age, DDC codes continue to play a vital role in cataloging online resources, ensuring that users can efficiently find relevant information. Whether you are a newcomer to library science or seeking to enhance your cataloging skills, mastering DDC codes will significantly benefit your information management endeavors.