Responsys has beefed up its email marketing, social media, mobile and channel marketing Interact suite with a retargeting application for display ads. Generally speaking, ad retargeting refers to the ad strategy of showing ads to consumers who may have visited a website, lingered over a product or two, and then decided to leave the page without buying anything. It may be that the consumer is still thinking about making a purchase (as the marketer hopes), or the shopper may have decided against the product in question (which critics of the practice argue is usually the case).
e-Commerce Times