# Placement Types

Chartboost supports fullscreen display interstitials (HTML5/MRAID ads: static, animated, user-interactive/playable ads), fullscreen video interstitials (VAST only), fullscreen rewarded videos & playables (VAST ads or MRAID user-interactive/playable ads), and banner placements (HTML5/MRAID creatives of size 320x50, 728x90, or 300x250). Bid requests contain all information needed to identify the supported creative formats, api versions, and protocol versions for a given ad request.  Placement type is indicated by the extension fields `banner.ext.placementtype` and `video.ext.placementtype`.  

* *Interstitial* placement requests will generally include both `imp.banner` and `imp.video` objects in the bid request, which means either creative format can be returned in the bid response.

* *Rewarded* placement requests, by default, will not include `imp.banner` object, as this is enabled only if you have Playable (User-Interactive) creatives.  If you plan to bid with Playable ads, see [Creative Type: Playables](/en/partners/exchange/creative-formats/#mraid-playables) for details on additional requirements.

* *Banner* placement requests will _only_ include a `imp.banner` object, and can be identified explicitly via the `imp.banner.ext.placementtype:"banner"` field.