# Fallback

> An alternative path or default invoked automatically when the primary operation fails or is unavailable.

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

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Explicit Inputs](https://banes-lab.com/records/lexicon/explicit-inputs.md) and before [Hidden Dependencies](https://banes-lab.com/records/lexicon/hidden-dependencies.md).

## Category

- [Core Vocabulary](https://banes-lab.com/records/lexicon-category/core-vocabulary.md)

## Required by

- [Graceful Degradation](https://banes-lab.com/records/architecture/graceful-degradation.md)
- [Circuit Breaker Pattern](https://banes-lab.com/records/architecture/circuit-breaker-pattern.md)

## Linked from

- [Error Handling / Resilience](https://banes-lab.com/ontology/principles/architecture-category-error-handling-resilience.md)
- [Model Architecture](https://banes-lab.com/ontology/principles/architecture-category-model-architecture.md)
- [Operations Concerns](https://banes-lab.com/ontology/lexicon/lexicon-category-operations-concerns.md)