The Ad gallery allows advertisers to:
- download and edit display ads created by third-party developers
- use templates to create display ads at scale
- edit and manipulate images and video footage to be used in their display ads
- create display ads to be used in any online or offline format
The Ad gallery allows advertisers to
Explanations:
The Ad gallery, formerly known as the display ad builder, is an ad-creation tool that offers various display ad formats in different categories, such as image ads, dynamic ads, Lightbox ads, and video ads, in any of your campaigns on the Google Display Network. Here are some benefits of using the Ad gallery: differentiated products and services; more effective campaigns; no-cost ad templates Customizable ad styles; industry-standard ad templates
Source
https://www.youtube.com/watch?v=3yisWoRyN7E