Internet provides abundant information resources and application services. It can not only transmit text, sound, images and other information, but also people thousands of miles away can realize on-demand, instant conversation, online conversation and so on through the Internet. The information on the Internet covers everything, from politics, economy, high-tech, military, to news that people like to see and hear. People can browse, query, download, copy and use this information very conveniently.
1、WWW
WWW(World Wide Web) means "World Wide Web", commonly known as "World Wide Web" or 3W, Web, which is an information query tool based on hypertext. It was originally developed by CERN in Geneva, Switzerland. WWW organically organizes the data and information on the Internet in different parts of the world, forming a huge public information resource network. The World Wide Web has brought hypertext services to the whole world. By manipulating the mouse of the computer, people can browse the information such as text, image, sound and video distributed all over the world on the Internet. In addition, WWW can also provide traditional Internet services, such as Telnet (remote login), FTP (remote file transfer), Gopher (menu-based information query tool) and UsenetNews (bulletin board system service of the Internet).
At present, the use of WWW greatly exceeds other Internet services, and a large number of new websites provide WWW commercial or non-commercial services every day. In addition, WWW can open up business communication activities in the market, and it is also an important means to spread public information. WWW has undoubtedly become an important medium for information dissemination. According to the survey, the number of users accessing WWW resources is on the rise in recent years. Through WWW, people can not only access and query the information resources they care about and want to obtain, but also put their information resources on the Internet for other users to access, thus narrowing their distance from the whole world, but the most benefit will still be the vast number of ordinary users connected to the Internet.
2、BBS
BBS is the abbreviation of bulletin board system, also known as bulletin board system. In the computer network, BBS system provides a network information system for users to participate in discussions, exchange information, publish articles and release news. A large BBS system can form a network system, which can be accessed through WWW or Tlnet. Some BBS only have a small email system, usually connected to the telephone line through a modem. BBS system is generally managed by system administrators, and users can be members of the public or registered members who have passed the qualification certification.
The original BBS was based on a personal computer, connected to the telephone line through a modem, and the number of visitors was also limited by the telephone line, while the BBS built in the form of Web was almost acceptable without limiting the number of visitors. At present, BBS involves a wide range of topics, and it is a place for issuing notices, meeting news, job hunting, special discussions, and difficult help. Here, everyone can post messages and get the information they need conveniently. BBS is like a virtual community, where people with the same interests often get together to discuss and communicate. BBS is already the most popular place on the Internet. The famous BBS sites in China are: Tsinghua, Shui Mu, etc.
Step 3 chat online
Chatting online is a very popular network service at present. People can install chat tool software and connect to one or more dedicated servers through the network to chat according to certain protocols. On the Internet, people use online chat rooms to send messages, such as text, and have real-time "conversations" with others. At present, online chat can not only transmit text information, but also transmit voice, video and other information, that is, voice chat room. It is precisely because the chat room has a very good real-time messaging function that users can even see the messages sent by the other party in a few seconds, and at the same time, they can choose many personalized pictures and language actions. In addition, when chatting, everyone can chat anonymously online, which gives everyone more freedom to speak.
Chatting online has brought a lot of convenience to people's lives and facilitated the communication between people. However, it also brings many negative effects, such as some people stay in chat rooms all day and forget to study and rest, some people cheat and commit crimes by chatting, and some people post some unhealthy information during chatting. Of course, we should also try to use chat technology to improve the quality of study, life and work. For example, in class, some teachers organize students to discuss learning content in chat rooms, or carry out some special seminars. At present, popular chat software systems include IRC, Web-Irc, ICQ/OICQ, etc.
4. File transfer protocol
FTP is a file transfer protocol and one of the most widely used protocols in computer networks. FTP is the abbreviation of file transfer protocol, that is, file transfer protocol. In the Internet, file transfer service adopts file transfer protocol (FTP). Users can connect to a remote host through FTP, copy software or free resources from the remote host to a local computer (the term is "client"), or copy files from the local computer to the remote host. For example, when we finish the webpage designed by ourselves, we can transfer these webpage files to the designated server through FTP software.
In the Internet, not all FTP servers can access and obtain resources at will. FTP host can give different users different file operation rights (such as read-only, read-write, finish, etc.) through TCP/IP protocol and the operating system on the host. Some FTP hosts require users to provide a legal registered account and password to access the host. However, those FTP servers that provide anonymous login generally only need the user to enter the account: anonymous, password: the user's mailbox to access the FTP host.
Commonly used FTP software includes LeapFTP7.0, CuteFTP, etc.
5. Newsgroups
Newsgroup is an electronic news dissemination tool on the Internet. Computers used to store e-mails and other information (e.g. electronic news) on the network are called news servers (NNTP servers). Newsgroups are "folders" stored on a server-specific computer, and each newsgroup contains emails with different topics and contents. Of course, there are many newsgroups with different topics on the server, and each newsgroup can have several sub-newsgroups.
Users can read electronic news by running the news reading program, so that the article information of the newsgroup will be displayed, including the author, subject, home page and sequel information of the article. Of course, users can also send their own information on newsgroups. If there are many people in a newsgroup, the newsgroup will continue to be created or exist, otherwise it will be automatically deleted.
6. E-mail
Electronic mail (E-mail) refers to a non-interactive communication mode in which the sender and the designated recipient use the computer communication network to send information. This information includes text, data, sounds, images, language videos and so on.
Because e-mail adopts advanced network communication technology, it can transmit various forms of information. Compared with traditional postal communication, e-mail has the advantages of fast transmission speed, low cost, high efficiency and all-weather automatic service. At the same time, the transmission of e-mail is not limited by time, place and place, and the sender and receiver can exchange letters at any time, so e-mail can spread rapidly. In recent years, with the continuous development and maturity of e-commerce and online services (e-cards, online shopping, etc.). ), e-mail will increasingly become the main way of communication.