The way we watch, read, and listen has changed completely in just a few decades. Marketers used to reach almost everyone with a TV commercial and a newspaper ad. Now, we jump between phones, laptops, and connected TVs all day. Marketers have built an invisible engine that follows us from screen to screen. It tries to show the right message at just the right moment. In this chapter, we explore that engine: the mix of traditional and digital channels, the tracking that makes it work, and the creative formats brands use to grab our attention.