Artifacts Used in Requirements Capture
A use-case model is model of a system containing actors and use cases and their relationships. It serves as an agreement between the customer and developers.
An actor is a user of the system that is external to the system. Actors can be people or things.
A use case:
An architecture description contains an architectural view of the use-case model. Only the architecturally significant use cases are shown.
We're not doing this part - the primary object is to learn UML not to build this thing.