The possible asset field types.

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

| Enums ||
|---|---|
| ## `AD_IMAGE` | This asset is used as an image. |
| ## `BUSINESS_LOGO` | The asset is used as a business logo. |
| ## `BUSINESS_NAME` | The asset was used as business name. |
| ## `BUSINESS_NAME_IN_PORTRAIT` | The asset was used as business name in portrait image. |
| ## `CALL` | This asset is used as a call. |
| ## `CALLOUT` | This asset is used as a callout. |
| ## `CALL_TO_ACTION` | The asset was used as a call-to-action. |
| ## `DESCRIPTION` | The asset was used in a description. Use this only if there is only one description in the ad. Otherwise, use the DESCRIPTION_1 or DESCRIPTION_@ enums |
| ## `DESCRIPTION_1` | The asset is used in description 1. |
| ## `DESCRIPTION_2` | The asset is used in description 2. |
| ## `DESCRIPTION_IN_PORTRAIT` | The asset was used as description in portrait image. |
| ## `DESCRIPTION_LINE_HEADLINE_AS_SITELINK_POSITION_ONE` | A description line asset used as a sitelink in position 1. |
| ## `DESCRIPTION_LINE_HEADLINE_AS_SITELINK_POSITION_TWO` | A description line asset used as a sitelink in position 2. |
| ## `DESCRIPTION_PREFIX` | The asset is used as a description prefix. |
| ## `HEADLINE` | The asset was used in a headline. Use this only if there is only one headline in the ad. Otherwise, use the HEADLINE_1, HEADLINE_2 or HEADLINE_3 enums |
| ## `HEADLINE_1` | The asset is used in headline 1. |
| ## `HEADLINE_2` | The asset is used in headline 2. |
| ## `HEADLINE_3` | The asset is used in headline 3. |
| ## `HEADLINE_AS_SITELINK_POSITION_ONE` | A headline asset used as a sitelink in position 1. |
| ## `HEADLINE_AS_SITELINK_POSITION_TWO` | A headline asset used as a sitelink in position 2. |
| ## `HEADLINE_IN_PORTRAIT` | The asset was used as a headline in portrait image. |
| ## `LANDSCAPE_LOGO` | The asset was used as a landscape logo. |
| ## `LEAD_FORM` | The asset is used as a lead form. |
| ## `LOGO` | The asset was used as a logo. |
| ## `LONG_HEADLINE` | The asset was used in a long headline (used in MultiAssetResponsiveAd). |
| ## `MARKETING_IMAGE` | The asset was used as a marketing image. |
| ## `MARKETING_IMAGE_IN_PORTRAIT` | The asset was used as a marketing image in portrait image. |
| ## `MOBILE_APP` | This asset is used as a mobile app. |
| ## `PORTRAIT_MARKETING_IMAGE` | The asset was used as a portrait marketing image. |
| ## `PRICE` | This asset is used as a price. |
| ## `PROMOTION` | This asset is used as a promotion. |
| ## `SITELINK` | This asset is used as a sitelink. |
| ## `SQUARE_MARKETING_IMAGE` | The asset was used as a square marketing image. |
| ## `STRUCTURED_SNIPPET` | This asset is used as a structured snippet. |
| ## `UNKNOWN` | The received value is not known in this version. This is a response-only value. |
| ## `UNSPECIFIED` | No value has been specified. |
| ## `YOU_TUBE_VIDEO` | The asset was used as a YouTube video. |