Piece of software or hardware that creates and runs virtual machines
A hypervisor, also known as a virtual machine monitor (VMM) or virtualizer, is a type of computer software, firmware or hardware that creates and runs virtual machines. A computer on which a hypervisor runs one or more virtual machines is called a host machine, and each virtual machine is called a guest machine. The hypervisor presents the guest operating systems with a virtual operating platform and manages the execution of the guest operating systems. Unlike an emulator, the guest executes most instructions on the native hardware.[1] Multiple instances of a variety of operating systems may share the virtualized hardware resources: for example, Linux, Windows, and macOS instances can all run on a single physical x86 machine. This contrasts with operating-system–level virtualization, where all instances (usually called containers) must share a single kernel, though the guest operating systems can differ in user space, such as different Linux distributions with the same kernel.
The term hypervisor is a variant of supervisor, a traditional term for the kernel of an operating system: the hypervisor is the supervisor of the supervisors,[2] with hyper- used as a stronger variant of super-.[a] The term dates to circa 1970;[3] IBM coined it for the 360/65[4] and later used it for the DIAG handler of CP-67. In the earlier CP/CMS (1967) system, the term Control Program was used instead.
^Goldberg, Robert P. (1973). Architectural Principles for Virtual Computer Systems(PDF) (Technical report). Harvard University. ESD-TR-73-105.
^Bernard Golden (2011). Virtualization For Dummies. p. 54.
^"How did the term "hypervisor" come into use?".
^Gary R. Allred (May 1971). System/370 integrated emulation under OS and DOS(PDF). 1971 Spring Joint Computer Conference. Vol. 38. AFIPS Press. p. 164. doi:10.1109/AFIPS.1971.58. Retrieved June 12, 2022.
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