Actors
An actor is a model element that describes a role that a user plays when interacting with the system being modeled. Actors, by definition, are external to the system. Although an actor typically represents a human user, it can also represent an organization, system, or machine that interacts with the system. An actor can correspond to multiple real users, and a single user may play the role of multiple actors.
Shape
An actor usually appears as a "stick man" shape.
In models depicting software applications, actors represent the users of the system. Examples include end users, external computer systems, and system administrators.
Naming Conventions
Each actor has a unique name that describes the role the user plays when interacting with the system.
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