âoeOh, and the difference between time-sharing on a mainframe and The Cloud is...?âoe
When I teach computer classes I talk about the evolution of computing from the days of the main frame behind the glass window, on the raised floor, that ran your applications and held all of your data. Then PCâ(TM)s were invented to âoeempower the userâ to take charge of their own applications and data, even though in some cases the PC had to be equipped with a card to be able to talk to the main frame to get at the data anyway. Then local area networks came along because some of that data needed to be shared, became too big to fit on a floppy disk and sneaker net, while great exercise became a bottleneck in accessing the data in a timely fashion. Then came the internet and cloud computing because we needed to share the data and applications with the world, which is basically the main frame - now a bunch of blade hardware and virtual machines, behind the glass window, maybe on the raised floor, that ran your applications and held all of your data. If you wait long enough things come full circle.