Generally, the following two virtualized modes are the most commonly used in today's virtualized environments:
- Fully virtualized mode: This enables an isolated and secure execution of one or more OSes in a single physical server where guest OSes use the host's OS resources (see Figure 8.1):

Figure 8.1: Windows Server 2019 running in an isolated and secure virtual environment
- Paravirtualized mode: This can be understood as a computer inside a computer that has an installed OS that does not simulate the hardware. Rather, it offers a special application program interface (API) so that we can modify the guest ...