> [!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/TargetCpm).

Target CPM (cost per thousand impressions) is an automated bidding strategy that sets bids to optimize performance given the target CPM you set.

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

| Fields ||
|---|---|
| ## `goal` Union field. Additional information related to bidding goal. `goal` can be only one of the following: ||
| ### `target_frequency_goal` | `TargetCpmTargetFrequencyGoal` Target Frequency bidding goal details. |