A relationship is bidirectional. Relationships can be unidirectional or bidirectional in their direction.
An owner side and an inverse side both exist in a bidirectional connection. A one-sided relationship only has an owning side. The owning side of a relationship controls how modifications to the relationship in the database are made via the Persistence runtime.
Each entity in a bidirectional relationship has a field or attribute referring to the other entity. The code of an entity class can access an object that is related to it through the relationship field or property. An entity is said to "know" about its associated object if it has a related field.
They have a bidirectional relationship, for instance, if Order knows which LineItem instances it owns and if LineItem knows to which Order it belongs. Only one entity has a connection field or property that relates to the other in a unidirectional relationship.
For instance, Product would not have a relationship field or property for LineItem, but LineItem would have a relationship field that identifies Product. To put it another way, LineItem is aware of Product, but Product is unaware of which LineItem instances are referencing it.
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