Virtualization Concepts
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Internal
Virtualization
Virtualization Platforms
Red Hat Virtualization
VMware vSphere
Microsof Hyper-V
Hypervisor
The entity that controls virtualization is referred to as hypervisor. The virtual machines are known as "guests" or "guest operating systems".
Hypervisors: KVM, Xen, VMware ESX.
Host Operating System
The host operating system (or the host OS) is the operating system of the physical computer on which the hypervisor is installed.
Guest Operating System
The guest operating system (or the guest OS) is the operating system that is running inside the virtual machine.