This entire instance can be stored as a vApp in the catalog and then later used to create the upgrade test environment in your Bluelock Virtual Datacenter. When the testing is finished, you can power off the vApp. What is a VDC in the context of cloud computing? A Virtual Datacenter in the context of cloud computing services falls within the Infrastructure-as-a-Service (IaaS) category. It enables you to quickly access cloud infrastructure from a service provider such as Bluelock.