Amazon sponsored display ads are retail aware, which means they show up only when your products are in stock and the ‘Featured Offer’. The ads will automatically stop if the products go out of stock or not the Featured Offer.
Display ads are efficient, and consequently, the ads are charged by CPC. However, you control how much you spend by setting the ad budget and bid per click. They are more like shotguns – less accurate but spray broad enough to strike something.
Since Amazon sponsored display ads have high impressions, they reach a wide range of customers making it an incredible option for branding.