Containers aren't virtualized, they're just isolated from each other. That's why they're cool. Instead of working at the IaaS level for each app, you can have

Containers aren't virtualized, they're just isolated from each other. That's why they're cool. Instead of working at the IaaS level for each app, you can have IaaS provide a cluster for containers to run in, and then put up a personal PaaS built out of containers - have more flexibility, spend less money, app folks don't have to worry about infra as much. And in the case that you're at a scale that you can use real hardware (or a hybrid approach), it's easy to move without the containers having to worry about it.