when you purchase a domain, such as your-domain.com, anything before the domain is called a subdomain. you can set these on your domain registrar's management panel.
i.e. mail.your-domain.com, mail is the subdomain of the domain your-domain.com
commonly, websites have www as a subdomain of their main domain to enable www.your-domain.com as well
发布评论
评论（2）
您所指的称为子域。在这里查看有关它们的更多信息：
http://en.wikipedia.org/wiki/Subdomain
What you are referring to is called subdomains. Have a look here for more information on them:
http://en.wikipedia.org/wiki/Subdomain
当您购买域名（例如
your-domain.com）时，该域名之前的任何内容都称为子域名。您可以在域名注册商的管理面板上进行设置。即
mail.your-domain.com，mail通常是your-domain.com域的子域，网站有
www作为其主域的子域，以启用www.your-domain.com如果您想了解有关域的更多信息，您可以查看此处：http://en.wikipedia.org/wiki/Domain_name、http ://google.com/search?q=domains, http://google.com/search?q=how+do+domains+work
when you purchase a domain, such as
your-domain.com, anything before the domain is called a subdomain. you can set these on your domain registrar's management panel.i.e.
mail.your-domain.com,mailis the subdomain of the domainyour-domain.comcommonly, websites have
wwwas a subdomain of their main domain to enablewww.your-domain.comas wellif you want to find out more about domains, you can look here: http://en.wikipedia.org/wiki/Domain_name, http://google.com/search?q=domains, http://google.com/search?q=how+do+domains+work