Virtual private servers Virtual dedicated servers are a form of Virtualisation that split a single physical Server into multiple virtual servers. The practice of partitioning a single server so that it appears as multiple servers has long been common practice in Mainframe computers, but has seen a resurgence lately with the development of software and technologies such as VMware , Xen FreeBSD Jail User-mode Linux ,Linux-VServer,FreeVPS ,OpenVZ, and Virtuozzo.