# Ports

> The requirement that the core define abstract interface points through which all external interaction passes.

Record: `lexicon:ports`
Kind: constraint
Layer: [Structural Core](https://banes-lab.com/records/layer/structural-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-ports

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Layer Separation](https://banes-lab.com/records/lexicon/layer-separation.md) and before [Replicated In-Memory State](https://banes-lab.com/records/lexicon/replicated-in-memory-state.md).

## Category

- [Codebase / System Architecture Styles](https://banes-lab.com/records/lexicon-category/codebase-system-architecture-styles.md)

## Required by

- [Ports and Adapters Architecture](https://banes-lab.com/records/architecture/ports-and-adapters-architecture.md)

## Linked from

- [Codebase / System Architecture Styles](https://banes-lab.com/ontology/principles/architecture-category-codebase-system-architecture-styles.md)
- [Infrastructure Concerns](https://banes-lab.com/ontology/lexicon/lexicon-category-infrastructure-concerns.md)