A virtual folder is a folder that exists on the website like http://mysite/folder/virtfolder/ .

Folder maybe an actual folder (directory) inside the webroot.. Virtfolder can be a virtual folder that doesn't exist in the real directory but the webserver "maps" this to an actual folder..

http://httpd.apache.org/docs/2.0/mod...ias.html#alias
http://weblogs.asp.net/owscott/archi.../10/87262.aspx