Which ad format should an advertiser that wants to promote several product Pins from its product group in a single ad use?

A Collections ad is designed to showcase multiple products within a single ad unit. It features a prominent hero creative (image or video) at the top, followed by three smaller, complementary product Pins below. This format allows users to explore several products directly from the ad, making it ideal for advertisers promoting a product group. Max width video ads and Standard ads typically focus on a single product or message. Idea ads are a multi-page format for storytelling and inspiration, not primarily for displaying multiple distinct products for purchase in a single view.