Use case diagrams graphically depict the interactions between the system and external systems and users. In other words, they graphically describe who will use the system and in what ways the user expects to interact with the system.

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Use case diagrams are a type of UML diagram that show the interactions between a system and its external actors (users or other systems), illustrating the different ways the system is used.

Use Case Diagrams Graphically Depict the Interactions Between the System