A creative or an ad is a marketing message that you want to convey to your users. You can choose from a wide range of sophisticated rich media ads like interstitials, expandables, video ads, simple banners, or text creatives. We recommended having multiple creatives for a proposition, as this helps in optimizing your marketing message based on the demand generated per creative.
These are some creative guidelines that you need to follow:
For creative specs and guidelines by the MMA, please see here.