Google Display Ads are the sponsored results that appear on various websites throughout the Google Display Network. Implementing the use of Display Ads allows you to reach an audience earlier in the buying cycle. By creating engaging headlines and descriptions; in addition to attractive images, Google Display Ads can help you find new customers or re-engage your existing customers at their point of interest. Targeting geographical, demographical, remarketing, and other detailed audiences; such as interests, topics, placements, and customer lists, favours a highly relevant capacity for reach – while driving higher quality results.
Google Responsive Display Ads are a type of display advertisement designed to automatically adjust their size, appearance, and format to fit various ad spaces across the Google Display Network (GDN). They are highly versatile, combining images, headlines, logos, and descriptions provided by advertisers to create ads optimized for performance.
More about the Google Display Network:
https://support.google.com/google-ads/answer/2404190?hl=en
To learn more about Audience Targeting on both the Search and Display Networks:
https://support.google.com/google-ads/answer/2497941?hl=en