Many host names used for the World Wide Web begin with www because of the long-standing practice of naming Internet hosts based on the services they provide. The host name of a web server is often www, in the same way that it can be ftp for an FTP server, and news and NNTP for a news server Usenet. These host names appear as Domain Name System (DNS) or subdomain names, as in www.example.com. The use of the web is not required by a technical or policy standard and many websites do not use it; In fact, the first web server ever was called nxoc01.cern.ch. According to Paolo Palazzi, who worked at CERN by Tim Berners-Lee, popular use www as a subdomain, it was accidental; On the World Wide Web project, it was intended to be published in www.cern.ch so info.cern.ch was intended to be the CERN homepage, but DNS registrations were never started and the Practice to put to www a domain name of the institute was then copied. Many established websites still use the prefix, or use other subdomain names, such as www2, secure or FR for special purposes. Many of these Web servers are set up so that the two main domain names (eg example.com) and the www subdomain (for example, www.example.com) refer to the same site; Others require one form or another, or can be mapped to different websites. The use of a subdomain name is useful for balancing incoming Web traffic by creating a CNAME record that points to a cluster of load-web servers. Since at present only one subdomain can be used in a CNAME, the same result can not be obtained by using the root of the naked domain.
When a user submits an incomplete domain name to a web browser in its address bar entry field, some browsers automatically try to add the “www” prefix at the beginning of it and maybe “. Com “,” .org “and” .net “at the end, depending on what they might be missing. For example, by entering “Microsoft”, it can be transformed into http://www.microsoft.com/ and openoffice at http://www.openoffice.org. This feature began appearing in early versions of Mozilla Firefox, when it still had the “Firebird” working title in early 2003, from a previous practice in browsers like Lynx. It is reported that Microsoft got a US patent for the same idea in 2008, but only for mobile devices.
In English, www is usually read as double u double u u double. Some users use dub-dub-dub, especially in New Zealand. Stephen Fry, in his series of podcasts “Podgrams”, wuh pronunciation Wuh wuh  English writer Douglas Adams once joked in The Independent on Sunday (1999). “The World Wide Web is the only thing I know whose shortened form takes three times longer to say that it is the abbreviation of”. In Mandarin, the World Wide Web is usually translated as a phono-semantic correspondence WAN wǎng Wei (万维网), which satisfies www and literally means “three-dimensional network” host, a translation that reflects the concept of design and proliferation of the World Wide The Web WWW Web is officially spelled as three separate words, each capitalized, with no intermediate hyphens. Your use of the www prefix is decreasing, especially when Web 2.0 Web applications have Tried to brand their domain names and make them easily pronounceable.Has gained popularity as a mobile web, services like Gmail.com, Outlook.com, MySpace.com, Facebook.com and Twitter.com are the More often quoted without adding “www.” (Or, again, “com”) to the domain.