Microsoft Hyper-V Server 2008 R2 is the hypervisor-based server virtualization product that allows you to consolidate workloads onto a single physical server. It is a stand-alone product that provides a reliable and optimized virtualization solution enabling organizations to improve server utilization and reduce costs.
Since Hyper-V Server is a dedicated stand-alone product which contains only the Windows Hypervisor, Windows Server driver model, and virtualization components, it provides a small footprint and minimal overhead.
It easily plugs into existing IT environments, leveraging existing patching, provisioning, management, support tools, processes, and skills.