> For the complete documentation index, see [llms.txt](https://help.nightfall.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.nightfall.ai/developer-api/key-concepts.md).

# Key Concepts

- [Entities and Terms to Know](https://help.nightfall.ai/developer-api/key-concepts/key_terms.md)
- [Setting Up Nightfall](https://help.nightfall.ai/developer-api/key-concepts/setup.md)
- [Creating API Key](https://help.nightfall.ai/developer-api/key-concepts/setup/api_key.md)
- [Creating Policies](https://help.nightfall.ai/developer-api/key-concepts/setup/policies.md)
- [Alerting](https://help.nightfall.ai/developer-api/key-concepts/alerting.md)
- [Scanning Text](https://help.nightfall.ai/developer-api/key-concepts/text_scan.md)
- [Scanning Files](https://help.nightfall.ai/developer-api/key-concepts/file_scan.md)
- [Supported File Types](https://help.nightfall.ai/developer-api/key-concepts/file_scan/supported_file_types.md)
- [File Scanning and Webhooks](https://help.nightfall.ai/developer-api/key-concepts/file_scan/webhooks.md)
- [Uploading and Scanning API Calls](https://help.nightfall.ai/developer-api/key-concepts/file_scan/scan_api_calls.md)
- [Special File Types](https://help.nightfall.ai/developer-api/key-concepts/file_scan/special_file_types.md)
- [Specialized File Detectors](https://help.nightfall.ai/developer-api/key-concepts/file_scan/special_file_detectors.md)
- [Webhooks and Asynchronous Notifications](https://help.nightfall.ai/developer-api/key-concepts/file_scan/webhooks_async_notifications.md)
- [Accessing Your Webhook Signing Key](https://help.nightfall.ai/developer-api/key-concepts/file_scan/webhooks_async_notifications/webhook_signing_key.md)
- [Creating a Webhook Server](https://help.nightfall.ai/developer-api/key-concepts/file_scan/webhooks_async_notifications/webhook_server.md)
- [Scanning Features](https://help.nightfall.ai/developer-api/key-concepts/scanning_features.md)
- [Using Pre-Configured Detection Rules](https://help.nightfall.ai/developer-api/key-concepts/scanning_features/pre_configured_detection_rules.md)
- [Scanning Images for patterns using Custom Regex Detectors](https://help.nightfall.ai/developer-api/key-concepts/scanning_features/pre_configured_detection_rules/scanning-images-for-patterns-using-custom-regex-detectors.md)
- [Creating an Inline Detection Rule](https://help.nightfall.ai/developer-api/key-concepts/scanning_features/inline_detection_rules.md)
- [Using Exclusion Rules](https://help.nightfall.ai/developer-api/key-concepts/scanning_features/exclusion_rules.md)
- [Using Context Rules](https://help.nightfall.ai/developer-api/key-concepts/scanning_features/context_rules.md)
- [Using Redaction](https://help.nightfall.ai/developer-api/key-concepts/scanning_features/redaction.md)
- [Using Policies to Send Alerts](https://help.nightfall.ai/developer-api/key-concepts/scanning_features/send_alerts_using_policies.md)
- [Detecting Secrets](https://help.nightfall.ai/developer-api/key-concepts/scanning_features/secrets_detection.md)
- [PHI Detection Rules](https://help.nightfall.ai/developer-api/key-concepts/scanning_features/phi_detection_rules.md)
- [Test Datasets](https://help.nightfall.ai/developer-api/key-concepts/test_datasets.md)
- [Errors](https://help.nightfall.ai/developer-api/key-concepts/errors.md)
- [Nightfall Playground](https://help.nightfall.ai/developer-api/key-concepts/nightfall_playground.md)


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