It is a system that supports the library. We divide it into classical (paper catalogs) or automatic (electronic medium). Automated library system is "application software operation (transaction) type, designed to automate the processes implemented in the library. Usually has a modular structure, typical modules as acquisitions, cataloging, OPAC, Loans and MVS, administration series. Usually contains tools for networks libraries and for communication with external sources. "It is further divided into different modules by function.