Information technology is a technology that studies the acquisition, transmission and processing of information. It is a combination of computer technology, communication technology and microelectronics technology, and is sometimes called "modern information technology". In other words, information technology is a new discipline that uses computer to process information and modern electronic communication technology to collect, store, process and utilize information, as well as related product manufacturing, technology development and information service. Information technology may be mechanical or laser; It may be electronic or biological. Information technology mainly includes sensing technology, communication technology, computer technology and microform technology. Information technology can expand people's information function. The task of sensing technology is to extend the information collection function of human sensory organs; The task of communication technology is to expand the function of human nervous system to transmit information; Computer technology is to extend the function of human thinking organs to process information and make decisions; Microform technology is to expand the function of human memory organs to store information. Of course, this division is only relative and general, and there is no clear boundary. For example, there is also information processing and collection in the sensing system, while there is both information transmission and information collection in the computer system. Information technology refers to the technology of information collection, identification, extraction, conversion, storage, transmission, processing, retrieval, detection, analysis and utilization. All departments involved in these processes and technologies can be called information departments. Information technology can extend or expand people's information function. Information technology may be mechanical or laser; It may be electronic or biological. Information technology mainly includes sensing technology, communication technology, computer technology and microform technology. The task of sensing technology is to extend the information collection function of human sensory organs; The task of communication technology is to expand the function of human nervous system to transmit information; Computer technology is to extend the function of human thinking organs to process information and make decisions; Microform technology is to expand the function of human memory organs to store information. Of course, this division is only relative and general, and there is no clear boundary. For example, there are also information processing and collection in the sensing system, while there are both information transmission and information collection problems in the computer system. At present, a large number of sensitive elements have been developed in sensing technology. In addition to ordinary cameras can collect visible light wave information, microphones can collect sound wave information, and now there are sensitive components in infrared and ultraviolet bands to help people extract important information that the human eye can't see. There are also ultrasonic and infrasound sensors, which can help people get information that those people can't hear. Not only that, people have also made various olfactory, gustatory, light-sensitive, heat-sensitive, magnetic, humidity-sensitive and some comprehensive sensitive elements. In this way, we can also extract useful information that can't be collected by various human sensory organs, thus prolonging and expanding the function of human collecting information. The development speed of communication technology is amazing. From the traditional telephone, telegraph, radio and television to today's mobile phone, fax and satellite communication, these new modern communication means accessible to everyone have greatly improved the efficiency of data and information transmission, so that the work that used to have to be done by professional telecommunications departments can be done directly and conveniently by the staff of administrative and business departments. Communication technology has become the supporting technology of office automation. Computer technology and modern communication technology together constitute the core content of information technology. Computer technology has also made rapid development, with smaller and smaller size and stronger functions. From mainframe, medium-sized computer and minicomputer to microcomputer, notebook computer and portable computer. From PC, 286,386 to 486,586, the application of computers has also made great progress. For example, the application of electronic publishing house system has changed the traditional printing and publishing industry; The application of computer word processing system has changed the writer's original writing style, which is called "pen-changing" revolution; The practicality of CD-ROM has greatly expanded the information storage capacity of human beings, and a new generation of electronic publications such as e-books came into being. With the development of multimedia technology, music creation and animation production have become the fields that ordinary people can set foot in. Microfilm technology has developed rapidly abroad, and the United States is the most developed country. For example, the world-famous American UMI Company is a publishing company that collects, stores and provides literature retrieval, and its service scope includes nearly/kloc-0.5 million kinds of books, periodicals, doctoral dissertations, archives and originals. Its products not only include printed matter and microfilm, but also provide machine-readable information. During World War II, the company used the so-called microfilm technology to save many precious documents of the British Museum. Up to now, the company has 654.38+ten thousand out-of-print books all over the world since15th century.