There are two technologies available to SMBs to deliver a centrally hosted Windows desktop experience to their users: Remote Desktop Services (RDS) or Virtual Desktop Infrastructure (VDI). RDS uses session virtualization to allow many users to log into the same instance of a Windows server OS and get a Windows desktop experience. VDI uses machine virtualization to allow multiple copies of a Windows desktop OS to run concurrently on the same physical server using a hardware abstraction layer called a hypervisor.