Virtual server:

A virtual server is an instance of a Web (HTTP) server that runs on the same physical computer as another instance of the same type of Web server, giving the appearance of being a separate HTTP server. Each virtual server has a unique domain name and IP address.

Virtual servers are frequently used by Internet Service Providers (ISPs) to enable different Web site owners to use and administer their own Web site as though they had complete control of the server. Users of virtual servers can administer their own file directories, add e-mail accounts and address assignments, assign multiple domain names that resolve to a basic domain name without involvement from the ISP, manage their own logs and statistics analysis, and maintain passwords.

See also:

Virtual Host

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