A concept is an abstract subject within a vocabulary or ontology.
In Marklogic Data Hub, you can use concepts to organize and group entities together based on similar characteristics. (See About Entities).
A concept class organizes concepts into groups based on similar characteristics.
Use concept classes in Marklogic Data Hub to consolidate and organize concepts to view and interpret data.
Entity to Concept Relationship
An entity to concept relationship describes the connection within the data of an entity and concept in the Hub Central user interace.