> [!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/ExperimentTypeEnum.ExperimentType).

The type of the experiment.

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

| Enums ||
|---|---|
| ## `AD_VARIATION` | This is an ad variation experiment. |
| ## `DISPLAY_AND_VIDEO_360` | This is a DISPLAY_AND_VIDEO_360 experiment. |
| ## `DISPLAY_AUTOMATED_BIDDING_STRATEGY` | An experiment that compares bidding strategies for display campaigns. |
| ## `DISPLAY_CUSTOM` | A custom experiment consisting of display campaigns. |
| ## `HOTEL_CUSTOM` | A custom experiment consisting of hotel campaigns. |
| ## `SEARCH_AUTOMATED_BIDDING_STRATEGY` | An experiment that compares bidding strategies for search campaigns." |
| ## `SEARCH_CUSTOM` | A custom experiment consisting of search campaigns. |
| ## `SHOPPING_AUTOMATED_BIDDING_STRATEGY` | An experiment that compares bidding strategies for shopping campaigns. |
| ## `SMART_MATCHING` | DEPRECATED. A smart matching experiment with search campaigns. |
| ## `UNKNOWN` | The value is unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |
| ## `YOUTUBE_CUSTOM` | A custom experiment consisting of Video campaigns. |