Search targeting is the main method through which Search Engine Marketers (SEM) target their users and historically has not been available for dislay advertisers. Search targeting uses keywords to match the search phrase a user enters on Google and is highly efficient because it targets the purchase intent of the reader.
Chango's propritary technology allows Search Targeting to be extended beyond search engine results pages and onto content sites. After all, if a reader just searched for "mexican cruises" a few minutes ago on Google then it is highly likely they are still intersted in "mexican cruises" a couple hours later when they are on a content site. The key difference being that the cost of displaying an advertisement on the content site is likely much more economicaly than the cost of a search engine ad!
Re-targeting enables you to display a customized ad in front of a customer that arrived at your e-commerce site and abandoned their shopping cart or simply left without a purchase. Re-targeting examines the search phrase they used to arrive to your site and allows you to get them back to your site - perhaps incentivizing them with a discount or special offer