The Dewey Decimal Classification (DDC) is a widely used library classification system that organizes books and other library materials by subject. It is used in many public libraries, school libraries, and academic libraries in the United States and other countries.

A library catalog is a tool that helps library users find materials they need. It provides access to information about library materials, such as the title, author, subject, and location of the material. It also organizes library materials by subject, making it easier for users to browse and find materials on a particular topic.

The Anglo-American Cataloging Rules (AACR2) is a set of rules for describing library materials. It is used in many libraries in the United States and other countries. AACR2 provides guidelines for creating bibliographic records that are consistent and accurate.

Subject headings are more specific than keywords. Subject headings are controlled vocabulary terms that are assigned to library materials by librarians. Keywords are terms that are chosen by users to describe the content of library materials.

A call number is a unique identifier that is assigned to each library material. It is used to organize library materials by subject. Call numbers are typically found on the spine of a book or on the label of a DVD or CD.

The Library of Congress Classification (LCC) is a classification system that is used to organize books and other library materials in the Library of Congress. It is also used in many other libraries around the world.

An open access library catalog is available online. This means that anyone with an internet connection can access the catalog and search for library materials.

A shelf list is a list of all the library materials that are located in a particular library. It is used to track the location of library materials and to help library staff find materials that are requested by users.

The Bliss Bibliographic Classification (BBC) is a classification system that is used to organize books and other library materials in the British Library. It is also used in some other libraries around the world.

A bibliographic record is more detailed than a catalog record. A bibliographic record contains all of the information that is necessary to identify and describe a library material. A catalog record is a brief summary of a bibliographic record.

The Colon Classification (CC) is a classification system that is used to organize books and other library materials in the National Library of India. It is also used in some other libraries around the world.

A union catalog combines the catalogs of multiple libraries. This allows library users to search for materials that are available in multiple libraries.

The Chinese Library Classification (CLC) is a classification system that is used to organize books and other library materials in the National Library of China. It is also used in some other libraries in China.

A subject catalog is organized by subject, while an author catalog is organized by author. A subject catalog allows library users to find materials on a particular topic. An author catalog allows library users to find all of the materials that have been written by a particular author.

The Library-Bibliographical Classification (LBC) is a classification system that is used to organize books and other library materials in the Russian State Library. It is also used in some other libraries in Russia.