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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.
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