Mappings describe the mapping of data from one topic to another, i.e. the data flow between e.g. devices and processing rules.
See also: Cybus::Mapping resource
By clicking on one of the listed mappings you get redirected to the Details View of the selected mapping.
The mapping has resources itself. In this case there are only Mappings.
See also: Mappings in the service commissioning file
These are the actual mappings from endpoint to topic, or vice versa, that have been specified.