# Publisher

> A component that emits messages to a topic or bus for subscribers to receive.

Record: `lexicon:publisher`
Kind: mechanism
Layer: [Execution Core](https://banes-lab.com/records/layer/execution-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-publisher

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Own Data](https://banes-lab.com/records/lexicon/own-data.md) and before [Reconciliation](https://banes-lab.com/records/lexicon/reconciliation.md).

## Category

- [Event Messaging Async](https://banes-lab.com/records/lexicon-category/event-messaging-async.md)

## Required by

- [Publish/Subscribe Pattern](https://banes-lab.com/records/architecture/publish-subscribe-pattern.md)

## Linked from

- [Event / Messaging / Asynchronous Architecture](https://banes-lab.com/ontology/principles/architecture-category-event-messaging-asynchronous-architecture.md)
- [Application Concerns](https://banes-lab.com/ontology/lexicon/lexicon-category-application-concerns.md)