Responsive Search Ads
Responsive search ads in the Search network allow you to set between 3-15 unique ad headlines (a.k.a. "titles") and 2-4 ad descriptions within a single ad. From there, Bing will select the most relevant headline and description combination for each given query and corresponding search user. By allowing Bing AI to select the most relevant headline and description for each query, we ensure that the right message lands for each of your potential customers, at the right time, across all possible intent signals.
Not everyone has this feature yet. If you don't, don't worry. It's coming soon.
The responsive ads shown to users appear identical to expanded text ads i.e., up to 3 headlines (title parts via expanded text ads) and 2 descriptions (text parts via expanded text ads). Two headlines and one description will always be shown in the ad. However, depending on the screen size, your ad may show without the third headline or second description.
Bulk API for Responsive Search Ads
The Responsive Search Ad Bulk record is available for managing responsive search ads i.e., you can upload or download data in this format.
Campaign Management API for Responsive Search Ads