Which Pinterest ad format allows advertisers to feature multiple images for users to swipe through?

Carousel ads are the correct answer because they are specifically designed to showcase multiple images or videos that users can swipe through within a single ad unit. This format is ideal for telling a story, displaying different product features, or showing a range of products. Standard ads feature a single image or video. Collections ads display a primary image or video with several smaller, related product images below it, but users don't swipe through the main visual. Idea ads are a multi-page format that combines videos, images, and text, but they are not primarily about swiping through multiple distinct images in the same way a carousel functions.