Marketplace Advertising Overview Marketplace advertising (Amazon Sponsored Products, Walmart Connect, eBay Promoted Listings) puts your products in front of shoppers with high purchase intent directly on the platform where they are shopping. Unlike Google/Meta, marketplace ads run within a closed ecosystem — clicks and conversions happen on the marketplace, not your site. The strategic work is campaign structure, keyword harvesting, and bid management. Amazon's native Campaign Manager UI handles most of this without code; automation tools like Perpetua or Sellics add bid optimization rules on…