OpenVZ is an open source container-based virtualization solution built on Linux. OpenVZ creates isolated, secure containers (otherwise known as VEs or VPSs) on a single physical server enabling better server utilization and ensuring that applications do not conflict. Each container performs and executes exactly like a stand-alone server; containers can be rebooted independently and have root access, users, IP addresses, memory, processes, files, applications, system libraries
and configuration files. See OpenVZ Wiki for more information.

OpenVZ is free open source software, available under GNU GPL. OpenVZ is the basis of Parallels Virtuozzo Containers, a commercial virtualization solution offered by Parallels. OpenVZ project is supported by Parallels.