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+title: "Worker"
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 # Chapter 5: Worker - The Task Doer
 
 In [Chapter 4: Broker Connection (AMQP)](04_broker_connection__amqp_.md), we learned how Celery uses a message broker, like a postal service, to send task messages. When you call `add.delay(2, 2)`, a message asking to run the `add` task with arguments `(2, 2)` gets dropped into a mailbox (the broker queue).