PAC stands for Public Access Catalog. It’s a library catalog that is open to the public and allows users to search for and access library materials. It’s also called a library catalog, or library database. It is a software that is used to manage and organize a library’s collection of books, journals, magazines, newspapers, videos, audio recordings and other types of materials. PAC allows users to search for specific items by title, author, subject, and other criteria, and it also provides information about the location, availability, and format of the materials. The PAC is used to help users locate and access the materials they need, and also to help library staff manage and maintain the collection.