As our businesses become increasingly digital, we tend to think about technology in non-physical terms. Our IT infrastructure becomes “the cloud.” Our servers and storage become “virtual.” Our networks become “software-defined.” The reality, however, is that information technology (IT) always depends on physical infrastructure. This white paper addresses five key aspects of IT that are inextricably tied to computing’s physical realities, even as that computing becomes more virtualized, software-defined, and cloud-based.