Virtualization: Virtual Machines
A virtual machine is flexible, as its physical form is a set of files, configuration file, and virtual disk files.
Virtualization: Cloud
Virtualization of IT resources makes cloud computing, as we know it, possible; it includes server virtualization, storage virtualization, and network virtualization.
Virtualization: Storage
Storage virtualization abstracts the physical resources, and a logical representation of them is presented to virtual machines by the hypervisor
Virtualization: Network
Virtual machines can be set up with virtual Network Interface Cards (NICs), which connect to virtual switches, creating a virtual network.