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A hypervisor is a type of software, firmware, or hardware that creates and runs virtual machines (VMs). It's also known as a virtual machine monitor (VMM) or virtualizer.
A hypervisor allows a single host computer to support multiple guest VMs by virtually sharing its resources, such as memory and processing. The hypervisor allocates the underlying physical computing resources such as CPU and memory to individual virtual machines as required.
Some examples of hypervisors are: VMware Fusion, Virtuozzo, Apple Hypervisor, VirtualBox, CrossOver, Parallels Desktop for Mac, QEMU, VMware ESXi.
There are multiple types of hypervisors. A Type 1 hypervisor runs directly on the underlying computer's physical hardware, interacting directly with its CPU, memory, and physical storage. For this reason, Type 1 hypervisors are also referred to as bare-metal hypervisors. A Type 2 hypervisor is better for individual users who want to run multiple operating systems on a personal computer.
Related Test: Cloud Computing Practice Test: Virtualization Technologies
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