An Integrated Library System (ILS) is a software solution that helps libraries manage their operations efficiently. It combines various functions such as cataloging, circulation, and inventory management into a single platform. This allows librarians to track books, manage user accounts, and streamline the borrowing process. ILS systems often include features like online public access catalogs (OPAC), which enable patrons to search for and reserve materials from anywhere. Popular ILS software includes products like Koha and Sierra, which are designed to enhance the overall user experience and improve library services.