What is a virtual image?
Virtual images provide the operating system and product binary files that are required to create a virtual system instance. Your system comes with preinstalled virtual images that can be extended to customize the operating system and other properties.
What is a virtual system?
Virtual systems implement deployment topologies from one or more virtual images and applications from the system catalog. Your system comes with preinstalled virtual system patterns that can be customized for the topology and configuration of your environment.
What is a virtual application?
Virtual applications are application centric deployments that can be customized to define the various properties and the required quality of service levels. At deployment time, the system determines the infrastructure and middleware that are required to host the virtual application.
Source: IBM PureSystems Centre