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+## Publisher Protocol (_PUB_)
+
+The ((_PUB_ protocol))(((protocol, _PUB_))) is one half of a ((publisher))/subscriber pattern.
+In this pattern, a publisher sends data, which is broadcast to all subscribers.
+The subscribing applications only see the data to which they have subscribed.
+
+The _PUB_ protocol is the publisher side, and the xref:sub.adoc[_SUB_] protocol is the subscriber side.
+
+The publisher delivers all messages to all subscribers.
+The subscribers maintain their own subscriptions, and filter them locally.footnote:[Thus, this pattern should not be used in an attempt to reduce bandwidth consumption.]
+
+The topics that subscribers subscribe to is just the first part of the message body.
+Applications should construct their messages accordingly.
+
+#### Socket Operations
+
+The xref:../sock/nng_pub_open.adoc[`nng_pub_open`] functions create a publisher socket.
+This socket may be used to send messages, but is unable to receive them.
+Attempts to receive messages will result in `NNG_ENOTSUP`.
+
+#### Protocol Versions
+
+Only version 0 of this protocol is supported.footnote:[At the time of writing, no other versions of this protocol have been defined.]
+
+#### Protocol Options
+
+The _PUB_ protocol has no protocol-specific options.
+
+#### Protocol Headers
+
+The _PUB_ protocol has no protocol-specific headers.
+
+### See Also
+
+xref:sub.adoc[Subscriber Protocol (_SUB_)],
+xref:../sock/nng_pub_open.adoc[nng_pub_open]