Kernel-based Virtual Machine (KVM) is a virtualization infrastructure for the Linux kernel that turns it into a hypervisor. It was merged into the Linux kernel mainline in kernel. It is now part of Linux kernel itself. It consists of a loadable kernel module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-intel.ko Intel or kvm-amd.ko for AMD cpu.
=> Read more: How to install KVM on Ubuntu 16.04 LTS Headless Server