|“||a] piece of software that provides abstraction of all physical resources (such as central processing units, memory, network, and storage) and thus enables multiple computing stacks (consisting of an operating system, middleware and application programs) called virtual machines to be run on a single physical host.||”|
The hypervisor presents the guest operating systems with a virtual platform and monitors the execution of the guest operating systems. In that way, multiple operating systems, including multiple instances of the same operating system, can share hardware resources.
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- Cybersecurity Assessment Tool , App. C: Glossary, at 5.