This document summarizes research on the impact of online display advertising. It finds that while click-through rates are low, display ads correlate with important consumer behaviors like searches and visits to advertiser websites. Those exposed to ads spent more time and visited pages more frequently on advertiser sites. They were also more likely to purchase online, with exposed consumers in some categories spending over 50% more than unexposed consumers. The research demonstrates display advertising's role in driving online and offline actions important for building brands over time.