> [!CAUTION]
> **Caution:** This documentation is for Google Ads API **v24** . The latest active version is [**v26**](https://developers.google.com/google-ads/api/reference/rpc/latest/AdvertisingChannelSubTypeEnum.AdvertisingChannelSubType).

Enum describing the different channel subtypes.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v24/enums/advertising_channel_sub_type.proto)

| Enums ||
|---|---|
| ## `APP_CAMPAIGN` | App Campaign that lets you easily promote your Android or iOS app across Google's top properties including Search, Play, YouTube, and the Google Display Network. |
| ## `APP_CAMPAIGN_FOR_ENGAGEMENT` | App Campaign for engagement, focused on driving re-engagement with the app across several of Google's top properties including Search, YouTube, and the Google Display Network. |
| ## `APP_CAMPAIGN_FOR_PRE_REGISTRATION` | App Campaign for pre registration, specialized for advertising mobile app pre-registration, that targets multiple advertising channels across Google Play, YouTube and Display Network. See <https://support.google.com/google-ads/answer/9441344> to learn more. |
| ## `DISPLAY_EXPRESS` | AdWords Express campaigns for display. |
| ## `DISPLAY_GMAIL_AD` | Gmail Ad campaigns. |
| ## `DISPLAY_MOBILE_APP` | Mobile app campaigns for Display. |
| ## `DISPLAY_SMART_CAMPAIGN` | Smart display campaigns. New campaigns of this sub type cannot be created. |
| ## `LOCAL_CAMPAIGN` | Campaigns specialized for local advertising. |
| ## `SEARCH_EXPRESS` | AdWords express campaigns for search. |
| ## `SEARCH_MOBILE_APP` | Mobile app campaigns for Search. |
| ## `SHOPPING_COMPARISON_LISTING_ADS` | Shopping Comparison Listing campaigns. |
| ## `SHOPPING_SMART_ADS` | Smart Shopping campaigns. New Smart Shopping campaigns cannot be created. |
| ## `SMART_CAMPAIGN` | Standard Smart campaigns. |
| ## `TRAVEL_ACTIVITIES` | Travel Activities campaigns. |
| ## `UNKNOWN` | Used as a return value only. Represents value unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |
| ## `VIDEO_ACTION` | Video TrueView for Action campaigns. |
| ## `VIDEO_NON_SKIPPABLE` | Video campaigns with non-skippable video ads. |
| ## `VIDEO_REACH_TARGET_FREQUENCY` | Video reach campaign with Target Frequency bidding strategy. |
| ## `VIDEO_SEQUENCE` | Video campaigns with sequence video ads. |
| ## `YOUTUBE_AUDIO` | YouTube Audio campaigns. |