The name of the site. Used internally by Sitecore to refer to a specific site.
A unique site may also be defined in Sitecore by using the sc_site string parameter. If this parameter is present in the incoming URL, its value is interpreted as the name of the requested site. The system searches for a site with such name among those declared in the web.config file. If the appropriate site is not found, the error occurs. If the sc_site query string parameter is not set, SiteResolver searches for the requested site using hostName and virtualFolder attributes.
Default value: no default value. It should be specified by the User.