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This article introduces the knowledge of "Why there is WWW in front of the domain name". In the operation of actual cases, many people will encounter such a dilemma. Then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Before we answer this question, we should know what www is. Www (World Wide Web), known as the "World wide Web" in China, is based on the client / server model. Based on hypertext markup language HTML and hypertext transfer protocol HTTP, www can provide Internet service-oriented and consistent user interface information browsing system. The www server uses hypertext links to link information pages, which can be placed on the same host or on hosts of different geographical locations; the chain routing uniform resource locator (url) is maintained, and the www client software (that is, www browser) is responsible for displaying information and sending requests to the server.

Internet uses hypertext and hypermedia to organize information, and extends the link of information to the whole Internet. Using www, users can not only access the information of web server, but also access FTP, Telnet and other network services. Therefore, it has become the most widely used and promising access tool on Internet, and is playing a more and more important role in business.

After understanding the basic concepts of www, let's go back to the website whether we want to add www or not. I don't know if you know about the first-level and second-level domain names of domain names. Take idcspy.com as an example, idcspy.com is a first-level domain name, and www.idcspy.com is a second-level domain name of it. People often point this second-level domain name resolution to its first-level domain name. In fact, it is the same second-level domain name as ftp.idcspy.com and test.idcspy.com, except that it now points to the first-level domain name.

In the early days of the Internet, large companies were able to access the Internet, and large companies needed a variety of services, such as e-mail, documents and FTP, which required multiple servers to support them. In order to distinguish these servers with different tasks, the form of sub-domain names such as www.abc.com,ftp.abc.com,mail.abc.com is used.

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