# Broker/Event Bus

> A runtime intermediary that routes messages between publishers and subscribers.

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

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Unified CRUD Model](https://banes-lab.com/records/lexicon/unified-crud-model.md) and before [Command/Query Separation](https://banes-lab.com/records/lexicon/command-query-separation.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)
- [Event Messaging Async](https://banes-lab.com/ontology/lexicon/lexicon-category-event-messaging-async.md)