> For the complete documentation index, see [llms.txt](https://support.sayprimer.com/primer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.sayprimer.com/primer/primer-support-review/audiences/building-an-audience.md).

# Building an audience

Define an audience with filters, estimate its size, then build and match it to a destination.

An audience is a set of people or companies you want to target, defined by filters. Primer estimates how many records match as you build, then matches that audience to an ad destination when you sync it.

## Estimating size as you build

As you add filters, Primer shows an estimated audience size. For **Meta, Google and LinkedIn**, Primer also shows a predicted **match rate** — the share of the audience that destination is expected to identify. See [Match rates](/primer/primer-support-review/audiences/match-rates.md) for what those numbers mean.

The estimate is a prediction of how many records match your filters, not the final matched count. Matching against a destination drops records the platform can't identify, so the delivered audience is smaller than the estimate. See [Audience size limits](/primer/primer-support-review/audiences/audience-size-limits.md) for the minimums and maximums that apply.

## Previewing your audience

Before you build, you can preview who matches your current filters. The preview shows up to the **first 250 records**, **25 at a time** across pages. It's a sample for sanity-checking your filters — not the full audience, and there's no export from the preview. To get the full matched set into an ad platform, build and sync the audience.

## From draft to live

A new audience starts as a **Draft**. Building and matching move it through **Running** and **Matching** to **Ready**, and syncing it to a destination makes it **Live**. See [Audience statuses](/primer/primer-support-review/audiences/audience-statuses.md) for what each status means and what to do at each one.


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