> [!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/FrequencyCapEventTypeEnum.FrequencyCapEventType).

The type of event that the cap applies to (for example, impression).

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

| Enums ||
|---|---|
| ## `IMPRESSION` | The cap applies on ad impressions. |
| ## `UNKNOWN` | Used for return value only. Represents value unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |
| ## `VIDEO_VIEW` | The cap applies on video ad views. |