State the function of a library catalog.

A library catalog is a database that contains records of all the materials held by a library, including books, journals, DVDs, and other resources. Its main function is to help users locate and access these materials by providing information such as the title, author, subject, and location of each item in the library's collection. Users can search the catalog by keyword, title, author, or subject to find specific items they are looking for, and use the information provided in the catalog to locate the item on the library shelves.

To provide access to information about the library's collection, including:

- Title, author, subject, and other bibliographic information
- Availability (whether the item is checked out or not)
- Location within the library
- Interlibrary loan status
- Patron status (fines, holds, etc.)