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Nested virtualizations are also possible e.g. There are many different hypervisors and software products (Microsoft Hyper-V, VMware Workstation, Oracle VirtualBox, Parallels Desktop are some of the big names in this area to name just a few – see full list here) and possibilities to install virtual machine on your existing physical computer.
Virtual Machine is a virtualized hardware (software defined) running your favorite operating system (OS) on a similar or different physical computer hardware and/or operating system. Host Machine is a physical computer that runs Hypervisor and Virtual Machines. Hypervisor is a software application used to manage your virtual machine (VM) appliance and communicate between a host computer / operating system or directly with physical hardware. VirtualBox – How To Create Ubuntu Virtual Machine on Windows 10 Host Basic Virtualization Terminology