Enum containing possible custom audience types.

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

| Enums ||
|---|---|
| ## `AUTO` | Google Ads will auto-select the best interpretation at serving time. |
| ## `INTEREST` | Matches users by their interests. |
| ## `PURCHASE_INTENT` | Matches users by topics they are researching or products they are considering for purchase. |
| ## `SEARCH` | Matches users by what they searched on Google Search. |
| ## `UNKNOWN` | Used for return value only. Represents value unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |