Represents the goal towards which the bidding strategy, of an app campaign, should optimize for.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/enums/app_bidding_goal.proto)

| Enums ||
|---|---|
| ## `OPTIMIZE_FOR_INSTALL_CONVERSION_VOLUME` | The bidding strategy of the app campaign should aim to maximize installation of the app. |
| ## `OPTIMIZE_FOR_INSTALL_CONVERSION_VOLUME_WITHOUT_TARGET_CPI` | This bidding strategy of the app campaign should aim to maximize installation of the app without advertiser-provided target cost-per-install. |
| ## `OPTIMIZE_FOR_IN_APP_CONVERSION_VOLUME` | The bidding strategy of the app campaign should aim to maximize the selected in-app conversions' volume. |
| ## `OPTIMIZE_FOR_PRE_REGISTRATION_CONVERSION_VOLUME` | This bidding strategy of the app campaign should aim to maximize pre-registration of the app. |
| ## `OPTIMIZE_FOR_RETURN_ON_ADVERTISING_SPEND` | The bidding strategy of the app campaign should aim to maximize all conversions' value, that is, install and selected in-app conversions while achieving or exceeding target return on advertising spend. |
| ## `OPTIMIZE_FOR_TARGET_IN_APP_CONVERSION` | The bidding strategy of the app campaign should aim to maximize just the selected in-app conversion's volume, while achieving or exceeding target cost per in-app conversion. |
| ## `OPTIMIZE_FOR_TOTAL_CONVERSION_VALUE` | The bidding strategy of the app campaign should aim to maximize all conversions' value, that is, install and selected in-app conversions. |
| ## `UNKNOWN` | Represents value unknown in this version of the API. |
| ## `UNSPECIFIED` | Not specified. |