Cloud computing and cool power

Why is cloud computing (云计算) and cool power (酷力量) related? The simplest example is to present the case is Steve Job's Apple.

As everyone knows, Apple has a range of highly popular gadgets and devices, from Mac, iPod, iPhone to the latest iPad.

But wait, what has it got to do with cloud computing?

Let me ask you one question, which gadget do you think is the most successful (or to be precise, the most revenue generating) one for Apple?