What are Models?
Models define the data binding for endpoints that use them.
Models enabling exchange of data representing accounts, advertisers, sites, etc. When a controller’s action is requested, an entity relationship is established by creating an object instance of its associated model which adheres to the expected terms of access via their properties and relationships.
Models Bindings to Other Endpoints
Since it is an entity relationship to stored data, as set of fields and related entities are available for controllers to use, only if it so chooses to make them available through its associated actions.
Models can have a one-to-many binding to multiple endpoints, but endpoints can only be bound to one controller.