An '''{{UBIK}} Plugin''' is intended to provide features on a rather low level (methods used within code, [[HowTo:Create_UBIK_Workflow_Activity_Plugin|workflow activities]], web service). The scope of a plugin should not cover additional structures (Metaclasses, Metaproperties, Classifications).
An '''{{UBIK}} Module''' can also include any kind of metastructures, additional to features as a {{UBIK}} Plugin. Hence, a {{UBIK}} Module is a much more comprehensive extension of the system.