What types of relationships are there in a Use Case diagram for an actor?

In a Use Case diagram, an actor can have the following types of relationships:

• Association — a simple connection between an actor and a use case, indicating that the actor interacts with this use case.
• Generalization — a relationship between an actor and another actor, where one actor is a specialized version of the other (role inheritance).

Other types of relationships, such as <<include>> and <<extend>>, relate to relationships between use cases, not actors.