The Add To Cart URL minimizes friction for your visitors and places them not on a search page or even a listing (where sponsored ads can distract from the goal) and instead places them on a page where it's solely the product and add to cart button.

This is a great URL to run for ads when you are well-positioned in search results, consistently doing volume, and instead merely want to focus on sheer sales volume in a paid ads campaign or an email campaign.

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