A publisher is an application that makes information about a specified topic available to a broker in a publish/subscribe system.
In a publish/subscribe system, an application, known as the publisher, can send a message to a message queue or port that is associated with an input node in a message flow that contains a Publication node. Depending on the transport used by the publisher, this input node might be an MQInput node, a SCADAInput node, or a Real-timeInput node.
Another application, known as the subscriber, can send a subscription request to the broker, which then sends relevant publication messages to the subscriber's message queue or port.
A published message can be requested by more than one subscriber, and a subscriber can request messages, on the same or different topics, from more than one publisher.
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