Hyper-V in Windows Server 2022 is a server role that lets you virtualize your environment to run multiple operating systems on a physical server.Hyper-V in Windows Server 2022 runs only on Standard or Datacenter Editions. Virtualization is a method for abstracting physical resources from the way they interact with other resources.There are multiple forms of virtulization available.
The Hypervisor is a thin layer of software that sits between the hardware and the operating system allowing one physical machine to run mutiple operating systems in different vitrual machines at the same time. It is also responsible for maintaining isolation between different Hyper-V partitions.
Windows Server 2022 has a feature called Hyper-V nesting that allows you to run a vitual machine in a virtual machine this can be useful in a training situation. A nice feature in Hyper-V is ablility to keep virtual networks isolated from the physical network infrastructure of the hosted system, admins can setup Hyper-V software defined virtualization policies so you are not limited by the IP address assignment or VLAN isolation requirements of the physical network.