> [!CAUTION]
> **Caution:** This documentation is for Google Ads API **v23** . The latest active version is [**v26**](https://developers.google.com/google-ads/api/reference/rpc/latest/AudienceInsightsCategory).

A Product and Service category.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v23/common/audience_insights_attribute.proto)

| Fields ||
|---|---|
| ## `category_id` | `string` Required. The criterion ID of the category. |