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 on the DoubleClick Ad Exchange from 2012 to 2013 due to strong demand. Nearly all advertiser categories posted double-digit growth in video ad spend and impressions each quarter as more utilize programmatic channels.