Your ad campaign results report the following metrics:
Spend: Cost of running a campaign.
Impressions: The number of times a shopper has viewed an ad.
Clicks: The number of times a shopper has clicked on an ad to transit to the ad landing page.
Orders: The number of orders placed through the native checkout on your ecommerce site and through your Buy with Prime checkout resulting from the campaigns that you’re running. Orders are reported by Meta and may not match the total orders you see reported in the merchant console or on your ecommerce site.
Sales: Income generated from an order, calculated as Price x Units. This total includes sales through the native checkout on your ecommerce site and through your Buy with Prime checkout.
Return on ad spend (ROAS): The effectiveness of your marketing, which is measured by sales/spend, including sales through the native checkout on your ecommerce site and through your Buy with Prime checkout.