# Masked Joins

Masked joins allow masked columns to be joined within the context of a project.

## How-to guide

[Enable masked joins guide](https://documentation.immuta.com/2025.1/governance/author-policies-for-data-access-control/projects-and-purpose-based-access-control/masked-joins/enable-masked-joins): Enable masked joins for data sources within your project.

## Concept guide

[Why use masked joins?](https://documentation.immuta.com/2025.1/governance/author-policies-for-data-access-control/projects-and-purpose-based-access-control/masked-joins/masked-joins-explained): This explanatory guide offers an example use case for implementing masked joins to highlight their business value.