Operating System-level Virtualization
In operating system-level virtualization, a physical server is virtualized at the operating system level, enabling multiple isolated and secure virtualized servers to run on a single physical server. The "guest" OS environments share the same OS as the host system – i.e. the same OS kernel is used to implement the "guest" environments. Applications running in a given "guest" environment view it as a stand-alone system. The pioneer implementation was FreeBSD jails; other examples include Solaris Containers, OpenVZ, Linux-VServer, AIX Workload Partitions, Parallels Virtuozzo Containers, and iCore Virtual Accounts.
Read more about this topic: Hardware Virtualization
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—William Burroughs (b. 1914)