The first time is the use of language, which has become an indispensable tool for human beings to exchange ideas and spread information. (time: post-Babel era).

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. (Time: Iron Age, about BC14th century)

The third time was the invention and use of printing, which made books, newspapers and periodicals an important medium for information storage and dissemination. (Time: In the 6th century, China began to have rigid printing, and it was not until the15th century that modern printing was perfected. The fourth time was the use of telephone, radio and television, which made mankind enter the era of spreading information by electromagnetic waves. (Time:19th century) The fifth time is the use of computers and the Internet, that is, the emergence of the Internet. (Time: Modern times, marked by the appearance of 1946 electronic computer) The first information technology revolution was the use of language. It happened about 35,000 to 50,000 years ago. The second information technology revolution is the creation of words. Around 3500 BC, the third revolution of information technology appeared in words, which was the invention of printing. Around 1040, China began to use movable type printing technology (Europeans began to use printing technology in 145 1 year).

The fourth information revolution was the invention and popularization of telegraph, telephone, radio and television. 1837, American Morse invented the world's first wired telegraph. The telegraph uses the principle of electromagnetic induction (when current passes, the electromagnet is magnetic, and when no current passes, the electromagnet is non-magnetic) to make the pen connected to the electromagnet rotate, thus drawing the symbols of points and lines on the paper tape. The proper combination of these symbols (called Morse code) can represent all the letters, so that these words can be transmitted through wires. 1844 On May 24th, the first telegram in human history was transmitted from the US Capitol to Baltimore, 40 miles away. Maxwell, a famous British physicist, published a paper (electricity and magnetism) in 1864, predicting the existence of electromagnetic waves. On March 1876 and March 10, Bell, an American, had a phone call with his assistant. 1895, Russian popov and Italian Marconi successfully conducted radio communication experiments respectively. The movie came out on 1894. 1925 TV was first broadcast in Britain.

The fifth information technology revolution began in the 1960s, which was marked by the popularization and application of electronic computers and the organic combination of computers and modern communication technologies.

* Excerpted from SOSO Ask.