A Smart campaign ad.

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

| Fields ||
|---|---|
| ## `descriptions[]` | `https://developers.google.com/google-ads/api/reference/rpc/v26/AdTextAsset` List of text assets, each of which corresponds to a description when the ad serves. This list consists of a minimum of 2 and up to 4 text assets. |
| ## `headlines[]` | `https://developers.google.com/google-ads/api/reference/rpc/v26/AdTextAsset` List of text assets, each of which corresponds to a headline when the ad serves. This list consists of a minimum of 3 and up to 15 text assets. |