> ## Documentation Index
> Fetch the complete documentation index at: https://confidence.spotify.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Audience

> The audience is the set of users or other units that you want to make eligible for an experiment.

An audience definition uses:

* inclusion criteria that decide what units to include
* allocation that sets the percentage of the included population to run the experiment on
* a targeting key that specifies the field in the evaluation context to randomize traffic based on
* exclusivity to control the behavior of the experiment in relation to other
  experiments, rules, and segments

## Inclusion Criteria

Inclusion criteria define which units are eligible for the experiment. You can combine multiple criteria types:

* **Attributes**: Target users based on evaluation context fields like country, platform, or version.
* **Segments**: Target users who belong to a pre-defined [segment](/docs/flags/segments), letting you reuse the same audience across experiments.
* **Holdbacks**: Include or exclude a random subset of users defined by a [holdback](/docs/surfaces/surface-settings#holdbacks) on a surface.
* **Groups**: Combine multiple criteria with `AND` or `OR` operators to build complex targeting logic.

Learn how to configure these criteria in the [Define the Audience](/docs/how-to-guides/define-audience-criteria) guide.

For more details about allocation, randomization, and the targeting key, go to the [audience](/docs/flags/audience) page for flags.

## Randomization

Confidence uses randomization to assign variants to users. To randomize,
Confidence needs to know which field in the evaluation context it should take
the value from. Read more in the [flag documentation](/docs/flags/audience#randomization).

## Sticky Assignment

Under **advanced options** in the **audience section** you can enable sticky
assignments. When you enable sticky assignments, Confidence writes all
assignments to a storage that is accessible at resolve time with low latency.
Read more about sticky assignment in the [flags documentation](/docs/flags/audience#sticky-assignments).

## Related Resources

<CardGroup cols={2}>
  <Card title="Audience Reference" href="/docs/flags/audience">
    Deep dive into audience configuration
  </Card>

  <Card title="Define Audience Criteria" href="/docs/how-to-guides/define-audience-criteria">
    Configure targeting criteria
  </Card>

  <Card title="Exclusive Experiments" href="/docs/experiments/exclusive-experiments">
    Set up mutual exclusion
  </Card>

  <Card title="Treatments Reference" href="/docs/experiments/treatments">
    Configure experiment variants
  </Card>
</CardGroup>