What is the difference between virtual and non-virtual?

If you want your web space URL to be http://www.yourcompany.com then you will either need your own web server, or to rent a virtual server. The latter is really just space on someone else's web server which has been configured to respond to requests for your domain. This service is generally slightly more expensive than non-virtual web space, where you simply have a subdirectory on someone else's web server, and your URL incorporates their domain name, such as http://www.someprovider.com/yourcompany.