A Virtual Private Server (VPS) is one step above shared server hosting. A Virtual Private Server (VPS) is a hosting environment that combines the benefits of both shared hosting and dedicated hosting. It does this by creating a virtual server that runs inside a hardware server via a specially designed partition.
Each Virtual Private Server partition runs its own operating system in a secure and private environment and cannot be accessed or interrupted by its neighbours.
This system gives you the same level of root access as a dedicated server whilst sharing the cost of the hardware. With a VPS you are virtually running your own server but at a fraction of the cost.

With our Windows Server 2008 Hyper V technology, our Windows VPS are tailor specially for meeting your needs in obtaining the same privilege and feasibility has owning a dedicated server. Testing and development are frequently the first business functions to take advantage of virtualization technology. Using virtual machines, development staffs can create and test a wide variety of scenarios in a safe, self-contained environment that accurately approximates the operation of physical servers and clients.
Hyper-V maximizes utilization of test hardware which can help reduce costs, improve life cycle management, and improve test coverage. With extensive guest OS support and checkpoint features, Hyper-V provides a great platform for your test and development environments.

With Xen hypervisor as the leading open source hypervisor for server , a thin software layer known as the Xen hypervisor is inserted between the server’s hardware and the operating system. This provides an abstraction layer that allows each physical server to run one or more “virtual servers”, effectively decoupling the operating system and its applications from the underlying physical server.
The Xen hypervisor is a unique open source technology, developed collaboratively by the Xen community and engineers at over 50 of the most innovative data center solution vendors, including AMD, Cisco, Dell, Fujistu, HP, IBM, Intel, Mellanox, Network Appliance, Novell, Red Hat, Samsung, SGI, Sun, Unisys, Veritas, Voltaire, and Citrix. Xen is licensed under the GNU General Public License (GPL2) and is available at no charge in both source and object format.