What is virtualization?

In philosophy, virtual means "something that is not real". In computer science, virtual means "a hardware environment that is not real". Here, we duplicate the functions of physical hardware and present them to an operating system. The technology that is used to create this environment can be called virtualization technology, in short, virtualization. The physical system that runs the virtualization software (hypervisor or Virtual Machine Monitor) is called a host and the virtual machines installed on top of the hypervisor are called guests.