A use case model is a type of software engineering model that describes the interactions between a system and its users. It is a graphical representation of the system's functionality, and it is used to help understand the system's requirements and to communicate those requirements to stakeholders.

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A use case model consists of a number of elements, including:

• Use cases: A use case is a description of a single interaction between a user and the system. It typically includes the user's goal, the steps involved in achieving that goal, and the system's responses.
• Actors: An actor is a person or other system that interacts with the system. Actors are typically represented by stick figures in use case diagrams.
• Relationships: The relationships between use cases and actors are shown in use case diagrams. The most common relationships are "extends" and "includes." A use case "extends" another use case when it provides additional functionality to that use case. A use case "includes" another use case when it reuses the functionality of that use case.