A hypervisor, also known as a virtual machine monitor or VMM, is a type of virtualization software that supports the creation and management of virtual machines (VMs) by separating a computer’s software from its hardware. Hypervisors translate requests between the physical and virtual resources, making virtualization possible. When a hypervisor is installed directly on the hardware of a physical machine, between the hardware and the operating system (OS), it is called a bare metal hypervisor. Some bare metal hypervisors are embedded into the firmware at the same level as the motherboard basic input/output system (BIOS). This is necessary for some systems to enable the operating system on a computer to access and use virtualization software.
Because the bare metal hypervisor separates the OS from the underlying hardware, the software no longer relies on or is limited to specific hardware devices or drivers. This means bare metal hypervisors allow operating systems and their associated applications to run on a variety of types of hardware. They also allow multiple operating systems and virtual machines (guest machines) to reside on the same physical server (host machine). Because the virtual machines are independent of the physical machine, they can move from machine to machine or platform to platform, shifting workloads and allocating networking, memory, storage, and processing resources across multiple servers according to needs. For example, when an application needs more processing power, it can seamlessly access additional machines through the virtualization software. This results in greater cost and energy efficiency and better performance, using fewer physical machines.
References:
https://www.vmware.com/in/topics/glossary/content/bare-metal-hypervisor.html
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