The first time is the use of language, which has become an indispensable tool for human beings to exchange ideas and spread information.

The second time was the appearance and use of characters, which made a major breakthrough in the preservation and dissemination of information, greatly exceeding the limitations of time and region.

The third time was the invention and use of printing, which made books, newspapers and periodicals an important medium for information storage and dissemination.

The fourth time was the use of telephone, radio and television, which made mankind enter the era of using electromagnetic waves to spread information. (Time:19th century)

The fifth is the use of computers and the Internet, that is, the emergence of the Internet. (Time: Modern, marked by the advent of 1946 electronic computer)

Extended data:

Information technology:

"Information technology" in "information technology education" can be defined from three levels: broad sense, middle sense and narrow sense.

1, information technology in a broad sense refers to the sum of various methods, tools and skills that can fully utilize and expand the functions of human information organs. This definition emphasizes the essential relationship between information technology and human beings.

2. In a sense, information technology refers to the sum of various technologies for information collection, transmission, storage, processing and expression. This definition emphasizes the general understanding of the functions and processes of information technology.

3, narrow sense of information technology, refers to the use of computers, networks, radio and television and other hardware equipment, software tools and scientific methods to obtain, process, store, transmit and use all kinds of text, sound, image information technology. This definition emphasizes the modernization and high-tech content of information technology.