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2

In a domain name, mostly started with prefix 'www'.is it used like a standard? ifnot, let me know, why?

+2  A: 

www stands for world wide web. Many web addresses begin with www, because of the long-standing practice of naming Internet hosts (servers) according to the services they provide.

WWW prefix

anishmarokey
A: 

A FQDN starting with "www." is used, by convention, for the machine hosting the primary website for a domain.

These days, where websites are more important then they were in the early days of the Internet, it is conventional to also run a webserver on the main machine for the domain (i.e. example.com rather than www.example.com) (these are usually the same machine) and redirect from one to the other.

David Dorward