Which of the following best describes the function of an Integrated Library System?

An Integrated Library System (ILS) is best described as a comprehensive system for library automation because it combines a variety of library functions into one cohesive platform. This includes circulation (checking in and checking out items), cataloging (keeping track of what items are in the library), and managing patrons (tracking library users and their activities). An ILS enhances operational efficiency, streamlines workflows, and provides tools for managing library resources in a digital environment.

While storing books in a digital format and preserving historical documents are important aspects related to libraries, they do not encompass the full range of functionalities and services provided by an ILS. Similarly, cataloging a set of physical books is a part of what an ILS does, but it is just one function among many others. The correct choice emphasizes the entirety of library automation and system integration, which is essential for modern library management.