What is a KVM and why is it useful? [closed]

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I understand that a KVM (Kernel-based Virtual Machine) is a Linux virtualization solution for machines with special hardware.

What I don't understand what this allows. What problems can you solve with a KVM? Where, when and why is it used?

Answer 1

From here:-

KVM is a type of hypervisor that enables, emulates and provides for the creation of virtual machines on operating systems. These machines are built on top of the Linux kernel, using operating systems such as Linux, Ubuntu and Fedora. KVM can be installed on all x86 processors and provide separate instruction set extensions for Intel and AMD processors.