A vCenter map is a visual representation of your vCenter Server topology. Maps show the relationships between the virtual and physical resources available to vCenter Server.
Maps are available only when the vSphere Client is connected to a vCenter Server system.
The maps can help you determine such things as which clusters or hosts are most densely populated, which networks are most critical, and which storage devices are being utilized. vCenter Server provides the following map views.
Virtual Machine Resources Displays virtual machine-centric relationships.
Host Resources Displays host-centric relationships
Datastore Resources Displays datastore-centric relationships
vMotion Resources Displays hosts available for vMotion migration.
This is available per virtual machine
You can customize all map views, except vMotion Resources maps.
All about Cloud Ecosystem based on VMware 