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developer/concepts/pubsub.md
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NATS implements a publish-subscribe message distribution model for one-to-many communication. A publisher sends a message on a subject and any active subscriber listening on that subject receives the message. Subscribers can also register interest in wildcard subjects that work a bit like a regular expression (but only a bit). This one-to-many pattern is sometimes called fan-out.
<div class="graphviz"><code data-viz="dot">
digraph nats_pub_sub {
rankdir=LR
publisher [shape=box, style="rounded", label="Publisher"];
subject [shape=circle, label="Subject"];
sub1 [shape=box, style="rounded", label="Subscriber"];
sub2 [shape=box, style="rounded", label="Subscriber"];
sub3 [shape=box, style="rounded", label="Subscriber"];
![pubsub](/assets/images/pubsub.svg)
publisher -> subject [label="msg1"];
subject -> sub1 [label="msg1"];
subject -> sub2 [label="msg1"];
subject -> sub3 [label="msg1"];
}
</code></div>
Try NATS publish subscribe on your own, using a live server by walking through the [pub-sub tutorial](../tutorials/pubsub.md).
Try NATS publish subscribe on your own, using a live server by walking through the [pub-sub tutorial](../tutorials/pubsub.md).