The other name for virtual private server hosting is virtual dedicated servers. These web hosting companies give multiple web hosting customers the amenities offered by dedicated servers through virtual computers.
Users share their system resources, such as RAM, with other users in virtual private servers. The sharing mechanism of virtual private web servers is so efficient [...]

Virtual Web Hosting - What Is Virtual Web Hosting?
Summary about virtual hosting by Carrie Reeder
If your web site has outgrown its shared hosting solution, it may be time to move it to virtual hosting, which is often seen as a low cost alternative to getting your own dedicated server. A virtual server gives you most [...]