There are at least two independent computers, and there is something to enjoy between them.
A channel that can keep contact between computers.
Some rules to ensure communication between computers.
Perhaps an example can better illustrate the role of these three parts. There are two philosophers, one lives in Greece and the other in Germany. They can only speak the local language. One day they will discuss the moral problems of the rabbit world with each other, so what should they do? First, the two philosophers will each find an electrical engineer, a translator and a telegraph. Then the Greek philosopher told his engineer his opinion, and the engineer translated it into English and sent it in Morse code. After receiving the telegram code, German engineers deciphered its meaning and then relayed it to German philosophers. In this way, German philosophers understood the thoughts of Greek philosophers.
In this example, two philosophers are equivalent to two computers, and there is something to enjoy between them (views on the moral problems in the rabbit world). Telegraph is the channel to ensure the contact between two philosophers, and two engineers who are also translators ensure the readability of communication between philosophers. They all follow the same rules (using Morse code to send English).
The above three components can be summarized as follows:
Some resources that can be * * * enjoyed-network services.
The channel to ensure mutual contact-the media.
Rules-protocols to ensure communication.
These three parts are often called the three elements of the network, and the huge network woven by them connects the whole world.
The basic function of the network not only provides us with a way to communicate with each other, but also is the richest information resource pool in human history, a huge free forum for people to exchange ideas with each other, and an e-commerce revolution combining modern high technology with commerce.
It mainly helps online users to realize the following basic functions:
Sending and Receiving E-mail Sending and receiving E-mail is one of the most basic and widely used services on the Internet. By using the Internet e-mail system, people can send and receive e-mails with network users all over the world conveniently, quickly and economically. Ordinary international mail usually takes about a week to deliver, while e-mail can be delivered instantly, and the price is about110 ~1/5 of ordinary mail. Due to the Multipurpose Mail Protocol (MIME), multimedia information (including images, text files, sounds, etc.). ) can be sent by email system. E-mail improves the speed and level of people's use of information, thus making e-mail the most popular way of communication. It is gradually replacing the traditional postal system. In countries with more Internet users, the traditional postal system has been severely impacted.
Network file transfer service In the early days of the development of Internr, a lot of file information in the network, especially computers, enjoyed free software and was transferred in the network through anonymous network file transfer (FTP), which played a very important role in the development of Internr. Even now, network file transfer service is still indispensable in Internet information transmission.
People can use the network file transfer service to download all kinds of practical software, data and files, which is of great significance to the enjoyment, transmission and exchange of information.
As the largest and richest information knowledge space in history, network information resource retrieval has almost unlimited information at present. Its information resources are mainly stored in network servers all over the world, and the information content is extremely extensive, including art, architecture, literature, business investment, international trade, economy, education, online library database, entertainment, movies, music, current affairs news, magazines, newspapers, sports, games, politics, military affairs, law, science and technology, environment, religion and so on.
At present, the resources of Internr are rich in WWW hypertext information, and the access utilization rate of WWW retrieval tools is the highest. The main WWW search engines are Yahoo, AltaVista, BigBook, EXeife, Infoseek, Lyeos and WebnCrawler. The above search engines generally provide users with two search methods, namely directory search and keyword search.
In short, as long as you need information, you can search directly on the Internet and get the information for my use.
Network news is in Internr, and there is also a worldwide free forum, namely network news. It uses Internet communication system to transmit network news. Network news is free, it includes more than 8000 topics, and the content involved is extremely rich. Anyone can find topics of interest and discuss and communicate with people who don't know each other all over the world.
Through online news, you can ask questions to people you don't know all over the world and state your views and opinions. If you often watch online news, you will get a lot of useful help from it, and it will become your mentor.
In addition to the network news USENET, readers can also browse the Internr multimedia news: n.com, which is the WWW news website established by CNN. CNN is the largest television news company in the world. Through this website, readers can not only browse the news content released by CNN around the world, but also get information about weather, sports and science. Science and technology, medical care, entertainment and other information, including the weather forecast in Beijing within four days.