Internet is a very extensive information base, which stores all kinds of information from astronomy to geography, mainly business, technology and entertainment information. In addition, the Internet is a global hub, through which you can learn information from all over the world. Send and receive e-mail; Chatting with friends; Online shopping; Watch movie clips; Read online magazines; You can also go to a concert; Of course, there are many other things we can do. We can simply summarize the following functions: information dissemination. You or others can freely input all kinds of information into the network for communication and dissemination. There are various forms of information dissemination on the Internet. More and more organizations and individuals use it to spread information around the world, and the content of information materials on the Internet is becoming more and more extensive and complex. At present, the Internet has become the largest advertising system, information network and news media in the world. Nowadays, in addition to commercial use, the Internet is also used for political propaganda by governments, political parties and organizations in many countries. Communication The Internet has an e-mail communication system. You can communicate with others by email instead of letters and faxes. You can even talk online and even hold a conference call. There is a special forum group on the Internet. Some people with the same major, industry or similar interests can put forward special topics for discussion online, and the papers can be stored online for people to read or supplement. Data Retrieval Because many people keep inputting all kinds of data to the Internet, especially the famous databases and information systems in many countries such as the United States have been surfing the Internet, the Internet has become the largest database with the most data, the most complete categories and the largest scale in the world. You can freely search the required data on the Internet. At present, the Internet has become an important source of information for many research and intelligence agencies in the world. The cyberspace created by the Internet is developing rapidly with explosive momentum. As long as you sit in front of the microcomputer, no matter where the other party is in the world, you can exchange information, buy goods, sign huge engineering contracts and settle international loans. Business leaders can gain insight into the business conditions of enterprises through the Internet, thus ensuring the development of enterprises: researchers can search libraries and databases in many countries through the Internet; Medical staff can discuss medical problems with colleagues all over the world through the Internet. Engineers can know the latest development trends of the same industry through the internet: business people can know the latest stock market and futures trends in real time through the internet, so as to seize every business opportunity in time and remain invincible forever; Students can also broaden their horizons and learn more useful knowledge through the Internet. In a word, the Internet can fundamentally change our existing life, study, work and thinking mode. No matter where we come from, the Internet can connect us with the world. The Internet enables us to sit at home and communicate with the world. With the Internet, the world is really small, and the Internet will change our lives. So, how does the Internet accomplish the above functions? This is the service it provides. Its services include WWW service, e-mail, file transfer (FTP), Telnet, news forum (newsgroup), newsgroup, bulletin board system (BBS), gopher search, file search (Archie) and so on. Users all over the world can get the information and functions provided by the Internet through these services. Here we briefly introduce the following common services: 1, sending and receiving e-mail (e-mail service) E-mail service is a service with the largest number of users and the widest contact surface among all information services on the Internet. E-mail can not only reach users who are directly connected to the Internet and access Internet nodes through telephone dialing, but also be used to communicate with users of some commercial networks (such as CompuServe, America Online) and other computer networks around the world (such as BITNET). The sending and receiving process of e-mail is very similar to the working principle of ordinary letters. First of all, let's look at the sending and receiving process of ordinary mail: now let's look at the sending and receiving process of e-mail: the difference between e-mail and ordinary mail is that it transmits electronic signals, not specific objects, so it can not only transmit words, graphics, but even animations or programs. E-mail can also send orders or letters. Because there is no need for printing and postage, the cost is greatly saved. By e-mail, thick samples with many photos like magazines can be simply sent out. At the same time, as long as you have access to the internet in the world, you can receive emails from others, unlike ordinary mail, you have to go back to the receiving address to get the letters. Internet provides users with perfect e-mail delivery and management services. E-mail system is very convenient to use. 2.* * * Access to TELNET is to allow users in one place to interact with applications running on computers in another place. Transfer from location A to location B by means of transportation, and then use the terminal of location B to call the supercomputing resources? This method is expensive and time-consuming, so it is not advisable. Wouldn't it be nice to move the terminal in position B back to position A? However, the distance between A and B is too far. Even if the terminal can be moved back, the line can't be connected. This method is not feasible. But with the Internet remote login service, users in place A can easily use the resources of supercomputer in place B through the Internet. Telnet enables you to access any computer system on the Internet from a host connected to the Internet as long as you are a registered user of the system. Its basic working process is like this. 3.FTP service FTP is the most important file transfer tool. It can transmit data in any format. With FTP, you can access various FTP servers on the Internet. There are two ways to access the FTP server: one is to register users to log in to the server system, and the other is to access the server anonymously. Let's see how FTP works. There are many public free softwares on the Internet, which allow users to transfer, copy, use and modify them for free. There are many kinds of public free software, from multimedia files to ordinary text files, from large internet software packages to small application software and game software. Making full use of these software resources can greatly save our software programming time and improve efficiency. Users can use the File Transfer Service (FTP) tool to get free software on the Internet. FTP is a real-time online service function that supports the transfer of files from one computer to another. At work, users must first log in to the FTP server. FTP can be used to transfer almost any type of files, such as text files, binary executable files, graphic files, image files, sound files, data compressed files, etc. With more and more government agencies, companies, universities and scientific research institutions storing a large amount of information in the form of open files on the Internet, FTP can be used to obtain information in almost any field. 4. Advanced browsing WWWWWW (World Wide Web) is an information "spider web" attached to the Internet and covering the whole world. It embeds countless information in the form of hypertext, including bright pearls and, of course, rotten garbage. Some people call it the World Wide Web, others call it the World Wide Web, or simply the Web (the Chinese translation of WWW is the "World Wide Web" suggested by the National Committee for the Examination and Approval of Scientific and Technological Terminology). WWW is the most popular, popular and up-to-date information retrieval service system on the Internet. It connects all the existing resources on the Internet, so that users can provide hypertext media resource documents on all the sites with WWW servers on the Internet. This is because WWW can seamlessly integrate all kinds of information (still images, text sounds and audio-visual). WWW not only provides fast information search on the graphical interface, but also can connect with other servers on the Internet through the same graphical interface (GUI). Because WWW provides people all over the world with the means to find and enjoy information, it can also be regarded as a collection of information that various organizations, scientific research institutions, universities and companies in the world are keen on research and development. It is based on Internet query. Information publishing and management system is a dynamic multimedia communication format for people to interact. Its formal expression is: "the original protocol of wide-area hypermedia information retrieval, the purpose of which is to access massive documents." What WWW has achieved is to provide a compatible means for users on the computer network to access various media in a simple way. It is the first truly global hypermedia network, which has changed the way people observe and create information. As a result, the research, development and use of WWW have quickly set off a huge upsurge all over the world. WWW was born in the Internet and later became a part of it. Today, the World Wide Web is almost synonymous with the Internet.