use case actors

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Actors can be people, other systems, time triggers, or event triggers. An actor specifies a role played by a user or any other system that interacts with the subject. It may represent roles played by human users, external hardware, or other subjects.

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primary actors are who are acting on the system

secondary actors are the who are acted by the system

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use case actors are who are the persons performing in the project.

primary use case actors are the who are acting on the system

secondary actors are the who are acting supporting by the system

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Primary Actors:
Actors who interact with the system to achieve the goal of the primary actors.
Secondary Actors:
These actors assist the goal of the Primary actors to achieve.
Example:
ATM machine:
Primary Actor:
* Customers
Secondary Actors:
* Database
* Printer

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Actors: They represent the end users who are performing an action on the system. Basically, they play a major role in using functionality of the system.
These are again classified into 2 types:
Primary Actors ? They are the ones who is using the system on behalf of the user or may be just who directly interacts with the system. 
Secondary Actors ? They are the ones who support the system flow to execute the functionalities.

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Primary Actor - Primary actors are mainly the stake holders through the process happens.

Secondary Actor - Secondary actors are the supporting factors which help the system to fulfill the action .

Eg :   Receptionist is receiving payment through Card uses swipe machine
 
          Here Receptionist is primary Actor and Swipe Machine will be the Secondary actor .

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The users that interact with a system.An actor can be a person, an organisation or an outside system that interacts with your application or system

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The users that interacts with the system. Actors can be people, other systems, time triggers, or event triggers. An actor specifies a role played by a user or any other system that interacts with the subject.
There are 2 types of actor:
1.Primary actor
2.Secondary actor
Primary actor are the one who acts upon the system , they carry out the functionality.
Secondary actor are the one who supports the system to carry out its functionality.