Internet is a worldwide computer network composed of various types and scales of independently operated and managed computer networks, including local area network (LAN), metropolitan area network (MAN) and large-scale wide area network (WAN). These networks connect the networks of universities, companies, scientific research institutions, military and government organizations in different countries through ordinary telephone lines, high-speed dedicated lines, satellites, microwaves and optical cables. The basic protocol of Internet interconnection is TCP/IP. Internet is the largest library in the world, which provides people with a huge and growing treasure house of information resources and service tools. Users can use various tools provided by the Internet to obtain the huge information resources provided by the Internet. Any Internet user anywhere can get any information from the Internet, such as nature, society, politics, history, science and technology, education, health, entertainment, political decision-making, finance, business, weather forecast, etc. Various software and hardware supporting the Internet and various systems composed of them provide various application systems for Internet users. These application systems organically combine all kinds of Internet information resources, thus constituting everything the Internet has. There is no need for ordinary users of the Internet to understand how these application systems complete their work, because the running process of these tools is carried out quietly in a way that users can't feel. Internet application system provides users with reliable, simple and fast Internet services.

Telnet connects remotely and uses the remote host.

E-mail sending and receiving e-mail

Mailing List Mailing List Multi-user Mail Distribution

Anonymous Ftp transmits public data information anonymously.

Archie document retrieval search anonymous FTP files

Information retrieval driven by hamster menu

Database information retrieval of WAIS wide area information server

Access to Hypertext Information in the World Wide Web

Usenet newsgroup's huge discussion group talks with one person and interacts with each other in real time.

IRC chat communicates with a group of people in real time.

Electronic white paper electronic phone book

BBS open * * * bulletin board information * * * enjoy electronic white version.

Electronic magazine, electronic magazine and electronic publication

Mud multiplayer game

Specifically, users can: query almost any needed information; Keep in touch with friends, relatives or colleagues around the world and exchange news, but the cost is only a small part of the cost of long-distance telephone calls or airmail letters; Discuss any issues you are interested in with people in other parts of the world; Connect and use libraries and information centers around the world; Search and copy countless files, periodicals, books and computer software; Play real-time games with many people in different regions and countries of the world.