Behind every great cloud is a whole bunch of expensive computers

As we saw in tech company earnings over the last couple of weeks, tech giants are making a lot of money on cloud computing. Amazon, Google and Microsoft rent out computer storage and computing power to smaller companies for lots of profit, and they spend a lot of money on it themselves, too. "Cloud" is kind of a misleading name, because it's really all about very expensive physical infrastructure on the ground, lots of powerful computers that live in huge temperature-controlled buildings called data centers. All big tech companies spend a lot on data centers for storage, computer power for artificial intelligence and to deliver services to their customers. And the business is only growing.