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An Actor specifies a role played by a user or any other system that interacts with the subject.

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Webel: MBSE: SysMLv1: Prefer a custom «actor» extension of a Block (such as the non-normative External) over UML-style Actor for use as parts in IBDs and on allocation swimlanes. You can also have a Trace from a block-based «actor» to a UML-style Actor.
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Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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UML keywords
Actor
UseCase::subject
UseCase
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An Actor specifies a role played by a user or any other system that interacts with the subject.
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Actors represent classifier roles that are external to the system that may correspond to users, systems, and or other environmental entities.
The use case diagram describes the usage of a system (subject) by its actors (environment) to achieve a goal, that is realized by the subject providing a set of services to selected actors.
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