---
title: Security identity relationship
slug: '243'
canonical_url: https://docs.coveo.com/en/243/
collection: glossary
source_format: adoc
---
# Security identity relationship
A {doctitle} is a link (that is, child, parent, or [alias](https://docs.coveo.com/en/176/)) between two [security identities](https://docs.coveo.com/en/240/).

Security identity relationships are crucial when evaluating [effective permissions](https://docs.coveo.com/en/194/), as they allow the [index](https://docs.coveo.com/en/204/) to resolve [granted identities](https://docs.coveo.com/en/201/), [groups](https://docs.coveo.com/en/202/), [virtual groups](https://docs.coveo.com/en/252/), and individual [user](https://docs.coveo.com/en/250/) entities.