Tapping into the power of collective buying, Groupon helps businesses attract customers by offering them a unique way to save on things to eat, see, and do in more than 500 markets worldwide. In each participating city, Groupon advertises a daily deal, typically a half-off coupon for anything from a local restaurant or retail store to a hotel or spa; if enough consumers buy the coupon online by midnight, the deal is on and the featured business can achieve a nice chunk in sales (Source: Hoover's Company Records).