Advantages and disadvantages of transmitting information

Information is not new, it has been widely existed in nature and society. The ancients made it at sunrise and stopped at sunset. It was the information brought by the sun that determined the time. Southern Yan declared spring, which is the message of spring brought by animals; More importantly, plants bring the news of autumn. For more than two thousand years, people have been constantly updating and improving the methods of transmitting information. It was not until the appearance of modern means of transportation that a huge postal system was formed in the world. Letters, newspapers and even parcels can be transported all over the world by train, ship and plane. However, the previous improvements only focused on communication methods, and the emergence of telegraph, telephone and radio made information completely out of the form of letters. 1844, Moore invented the telegraph. Later, Bell and vautrin invented the telephone. 1902, stepford invented radio broadcasting again. In this way, the information becomes electromagnetic waves and is sent out. Almost at the same time, people can know the content of the message through receivers, telephones and radios. This is really an earth-shaking revolution in the history of communication! People are still not satisfied, and they have found new problems: telegrams and telephones are becoming more and more popular, and wires and cables for transmitting information often "block traffic" like narrow and crowded roads, either busy or cross-connected. So, scientists came up with a method of laser communication: the communication capacity of a bundle of optical fibers is 250,000 times that of copper wires, and a single optical cable can connect 1 100 million lines. In other words, 200 million people can talk at the same time without interfering with each other. Laser communication was quickly adopted, and in the late 1980s, 6,000 kilometers of submarine optical cable was laid across the Atlantic Ocean.

1993, American Arbel proposed to build an information superhighway to connect computers in factories, mines, railways, schools, shops, banks, libraries, tourist attractions, literary and art units, research departments, government departments and families, so that people can receive words, sounds and images spread to any place at any time. This proposal has attracted the attention of all countries, and the information industry has developed rapidly. Only a few years later, the information network has covered many countries and regions, and "Heaven is still our neighbor" is no longer a dream.

Today, the world has entered the information age, and information is closely related to us. The amount of information in modern society is increasing, the speed of information transmission is getting faster and faster, and the ways for people to obtain information are getting wider and wider. Learning to collect and process information is of great significance to the development of society and individuals.

Modern information transmission through the network has had a great impact on people's lives and brought great convenience to people's work and life. For example, banks use the Internet to deposit and withdraw money from ATMs, post offices use the Internet to send money quickly, doctors use the Internet to treat patients at home, and audiences watch performances at home through the Internet ... as long as we want, the Internet can do it.

With the rapid development of computer technology, people have successfully developed computers with multimedia functions. Today, this kind of computer has entered the homes of ordinary people. People can use it to watch TV, listen to the radio, make phone calls, send faxes, listen to CDs, watch VCD and sing karaoke ... If your multimedia computer is connected to the information superhighway that runs through the world, you can also get the latest information from all over the world at home. This is why a scholar can know everything about the world without leaving home! "The magical network information superhighway fascinates many people because it provides so much convenience for people. Sometimes, just like an angel, it helps you do many things you think. However, the network can sometimes become the devil, making people lose their way and even go astray. Unhealthy websites and indulging in online games are very harmful to teenagers.