A virtual machine is an abstraction of an actual computer. A virtual machine is created when a virtual machine is created, allowing a process running in the host OS to call a process running in the guest OS.
The difference between the two is simply that the virtual machines are created and run the host OS.
For example, a virtual machine is created when the virtual machine is created, and it is then ran the host OS. The guest OS is not run by the virtual machine and is not necessary to it.
But a virtual machine is not necessary to the host OS. You can create a virtual machine on a normal computer and run it in another computer.
You can only run a virtual machine if it is also running the host OS, but the virtual machine is not required to be running the host OS. The guest OS is just a layer that performs some tasks and abstracts the host OS’s virtual machine structure.
Creating a virtual machine is like having a virtual keyboard. You just have to create a keyboard on a keyboard. It’s just like having a keyboard on a computer.
You can’t host a virtual machine and a host OS at the same time. The reason this is so is because the virtual machine creates its own virtual memory and the host OS can’t access it.
As you probably guessed, virtual machines are not just a host OS on top of a virtual machine but actually a virtual OS. You can host many guest OSs and each one has its own virtual memory and you can have as many virtual machines as you want to run at the same time.