Library Catalogue System refers to the systematic list of library items available in the library. It keeps a systematic cataloging by creating a database according to the title, author, and keywords of the books.
OPAC (On-line Public Access Catalogue) - it facilitates online search through bibliographic search depend upon subject, title, author, etc. It helps the user to search whether a book is available in the library or not.
It is further divided into four types: