In Unified Modeling Language (UML), an **Actor** represents a role that a user or any other system plays when interacting with the system being modeled. Actors are typically used in use case diagrams to illustrate the interactions between the system and the external entities that influence its behavior. ### Key Characteristics of Actors in UML: 1. **External Role**: An actor is not part of the system itself; instead, it exists outside the system and interacts with it.
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