Library and information system refers to a collection system that manages, preserves, transmits, uses and studies books and documents based on libraries, museums, archives and other institutions and by means of information technology. It is a complex system engineering, including the collection, processing, storage, retrieval and service of document information, which plays a very important role in the modern information society.

Library information system includes three elements: books, information and services. Among them, books are the main body of all kinds of documents, information refers to various forms and means of collecting, processing, describing, storing and transmitting documents, and service is to enable users to make more convenient and efficient use of document information through service methods, service channels and service modes.

Library and information system plays an important role in the information construction of today's society. It can help researchers and readers to obtain and use the needed information more quickly and accurately, and can also provide various information services for the government, enterprises and institutions. In addition, the library and information system also provides a solid foundation and support for the construction of literature information in the fields of cultural heritage, academic research, scientific and technological development, social management and so on. Therefore, the library and information system is an indispensable part in the information construction of modern society.