Virtualization – A fancy way of saying terminal and a keyboard.
Back when Bill Gates was a kid in high school he had a terminal, keyboard and a modem hooked up to a mainframe somewhere. Because resources were precious (processors, memory, hardware and software) and expensive he was only allowed to use it for a certain period of time.
This isn’t the case anymore nowadays. All of the resources that were precious are quite common today. But the same challenges to computing remain. How do I get access to data given the availability of hardware and software? One answer to that puzzle is virtualization.