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I have seen on the web some domain names having prefix of ww2 or ww3 or so (ww2.somedomain.example, ww3.yourdomain.example). And these happen mostly when traveling from a page to page. What would be the reason of having such subdomains? Is there anything special about them or are they just another sub domain? I mean, are they useful in any particular context?
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www and ww2 are subdomains. They have no special meaning to a browser, other than the fact that they are part of a larger domain. These days, the above subdomains are used mostly on the basis of tradition.
A subdomain name is a piece of additional information added to the beginning of a website's domain name. It allows websites to separate and organize content for a specific function — such as a blog or an online store — from the rest of your website.
What is www2? Www with a number added is a slightly old-school domain naming technique that is still used by some websites. Developers use it to identify and name subdomains or hostnames that belong to different servers.
Subdomains are the part of a domain that comes before the main domain name and domain extension. They can help you organize your website. For example, docs.themeisle.com . In this URL, docs is the subdomain.
People running large(-ish) sites used to do this when they needed to break up the load between more than one server. One machine would be called www then the next one would be called www2, etc.
Today, much better load balancing solutions are available that don't require you to expose your internal machine naming conventions to the browser clients.
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Technically, the initials before the primary domain name (e.g. the "mail" in mail.yahoo.com) can be best though of as a machine name, identifying the web server/mail server, whatever. They can also identify a group of machines (a web farm).
So the person building up that machine can call it anything they want. The initials www are a (somewhat arbitrary) convention.
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