Analysis:

The process of organizing and storing information in a certain way and finding out relevant information according to the needs of users. Also called information storage and retrieval, information retrieval. Searching for information begins with the reference work of the library. The term "information retrieval" appeared in the 1950s. Information retrieval includes three main links: ① analysis and coding of information content, information recording and generation of retrieval marks. (2) Organize and store all ordered information recorded in the form of files and databases. ③ User's problem handling and retrieval output. The key part is the matching and selection of information questions and information * * *, that is, comparing the similarity between a given question and records in * * *, and selecting relevant information according to certain matching criteria. According to the object, it is divided into document retrieval, data retrieval and fact retrieval; According to the equipment can be divided into manual retrieval, mechanical retrieval and computer retrieval. Service facilities composed of certain equipment and information are called information retrieval systems, such as punched card system, online retrieval system, CD retrieval system, multimedia retrieval system, etc. Information retrieval was first used in libraries and scientific and technological information institutions, and then gradually extended to other fields, and combined with various management information systems. Theories, technologies and services related to information retrieval constitute a relatively independent knowledge field, which is an important branch of information science and intersects with computer application technology.