In Hierarchy Manager, a

relationship

describes the affiliation between two specific entities. Hierarchy Manager relationships are defined by specifying the relationship type, hierarchy type, attributes of the relationship, and dates for when the relationship is active. Information about a Hierarchy Manager entity is stored in a

relationship base object

. A 

relationship type

describes classes of relationships. A relationship type defines the types of entities that a relationship of this type can include, the direction of the relationship (if any), and how the relationship is displayed in the Hub Console.