Using virtualization architecture changes the usage habits of physical servers. Instead of a one-to-one relationship in physical infrastructure, you can establish a one-to-one relationship with virtualization. This relationship provides significant savings in both capital and operational expenses. This relationship is called consolidation.
Virtualization is usually hypervisor. Hypervisor separates operating systems and applications from underlying computer hardware; thus, the host can run multiple virtual machines (VMs) as a guest sharing physical computing resources such as the system's processor process cycles, memory space, and network bandwidth.
The server, desktop, application, and storage can be briefly summarized as virtualization.