This document discusses the growth of multi-screen viewing, where consumers watch TV and engage with a second screen like a smartphone or tablet simultaneously. It outlines three key reasons for this growth: the rise of mobile device usage, increased multi-tasking, and comfort with mobile advertising. The document also explores how marketers are leveraging multi-screen opportunities, such as driving engagement during live events, incentivizing ad interactions, and syncing TV content with mobile purchases. To succeed, marketers must understand audiences, create intuitive multi-screen experiences, maintain relevant content, and constantly engage users across devices.