虚拟域名实际上是虚拟主机的一种。 虚拟主机的出现是为了节省硬件的投资。如果ＩＳＰ为每个申请了域名的用户都使用一台单独的机器，显然费用会很高，而且对于访问不是频繁的站点来说也是一种浪费。所以就出现了大家共用一台机器，但每个用户之间相互独立，功能完全等同于拥有 Virtual domain name is actually a virtual host. The emergence of virtual hosting is to save the hardware investment. If the ISP uses a separate machine for every user who has applied for a domain name, the cost will obviously be prohibitive and a waste of access to less frequent sites. So there we share a machine, but each user independent of each other, the function is exactly the same as having