KVM is Kernel-based Virtual Machine. It's a module built directly into the Linux kernel that allows the operating system to act as a hypervisor. Although some people may prefer a third-party solution like VirtualBox, there's no need to install extra software since the Linux kernel already gives us the necessary tools we need to make virtual machines.
This is a companion discussion topic for the original entry at https://linuxconfig.org/install-and-set-up-kvm-on-ubuntu-20-04-focal-fossa-linux