Azure – Microsoft’s vision of cloud computing
Comparing to cloud computing, on-premises computing can be expensive. You need to buy the right hardware and the software, have the people to maintain and keep everything up to date and there are also other expenses, like electric power, real estate costs etc. Comparing to that, Cloud solutions are accessed online and usually hosted by a third-party vendor. The second difference between them is the “pay as you go” or on-demand usage service model comparing to the traditional upfront capital expenditure, as it is the case with on-premises computing.