You search for toothpaste online. While browsing a retailer’s app or checking your email, you see an ad for toothpaste. After that, you return to the site and make the purchase. The retailer now knows what you browsed, what you bought, and which ad you saw before checking out. It connects your initial search, your ad exposure, and your final purchase. This insight is then packaged and sold to toothpaste suppliers. That is retail media in action.