> For the complete documentation index, see [llms.txt](https://documentation.immuta.com/SaaS/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/reference-guides.md).

# Reference Guides

- [Data Policies Reference Guide](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/reference-guides/data-policies.md): Learn how protect policies and reveal policies enforce access controls
- [Masking Policies](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/reference-guides/masking-matrix-functions.md): Learn about the types of masking policies Immuta supports
- [Orchestrated Masking Policies](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/reference-guides/masking-matrix-functions/orchestrated-masking-policies.md)
- [Row-Level Policies](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/reference-guides/row-redaction-explained.md): Learn how row-level policies limit what data users are allowed to see once they are granted access to a data source
- [Limit to Purpose Policies](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/reference-guides/limit-to-purpose-policies.md): Learn how purpose policies limit users' access to data
- [Custom WHERE Clause Functions](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/reference-guides/custom-where-clause-functions.md): Learn about the custom WHERE clause functions Immuta supports
- [Lookup Tables](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/reference-guides/lookup-tables.md): Learn how lookup tables can be used to reference user metadata


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