2018/12/13: top customers want to move their corporate data "across multiple cloud environments with no lock-in." That means a hybrid cloud.
A hybrid cloud is one that runs simultaneously on a public and private cloud. Historically, that's been done with three models: Hybrid-cloud management software such as HPE Helion; vendor-native hybrid cloud platforms, such as Microsoft with Azure and Azure Stack; and Platforms-as-a-Service (PaaS) clouds, including Cloud Foundry, which can bridge over Infrastructure-as-a-Service (IaaS) clouds.
There are places for each of these approaches, but the first two tend to be difficult to deploy. The PaaS model is easier... if you want to run a PaaS.