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.
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.
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www代表万维网。许多网址以 www 开头，因为长期以来根据互联网主机（服务器）提供的服务来命名它们。WWW 前缀
wwwstands forworld 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
以“www”开头的 FQDN。按照惯例，用于托管域的主网站的计算机。
如今，网站比互联网早期更加重要，通常在域的主机上运行网络服务器（即 example.com 而不是 www.example.com）（这些是通常是同一台机器）并从一台机器重定向到另一台机器。
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.