Growing numbers of advertisers and publishers are embracing programmatic channels for video advertising, where real-time markets allow buyers and sellers to buy and sell video ads at scale with lower costs. Data shows that in-stream video ad impressions tripled year-over-year on the DoubleClick Ad Exchange, and the number of publishers monetizing video content doubled, as advertisers in categories like retail and automotive quadrupled their spending. Nearly all advertiser categories posted double-digit growth in video ad spend and impressions each quarter.