The possible ad rotation modes of an ad group.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/enums/ad_group_ad_rotation_mode.proto)

| Enums ||
|---|---|
| ## `OPTIMIZE` | Optimize ad group ads based on clicks or conversions. |
| ## `ROTATE_FOREVER` | Rotate evenly forever. |
| ## `UNKNOWN` | The received value is not known in this version. This is a response-only value. |
| ## `UNSPECIFIED` | The ad rotation mode has not been specified. |