Can anyone tell me what is "publish and subscribe model"?

hi experts:
can anyone tell me what is "publish and subscribe model" in detail?
many thanks

Publish-Subscribe Model
Purpose
This model defines how you publish messages to and receive messages from a well-known node. Such nodes are referred to as topics. You can use the model for:
·        Creating Message Producer to a Topic
·        Creating Message Consumer to a Topic
·        Managing Durable Subscriptions
Chk this for more.
http://help.sap.com/saphelp_nw04/helpdata/en/aa/34518672fa44c79340c1f61556443e/frameset.htm

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Can anyone tell me what is "publish and subscribe model"?

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