The previous chapter detailed the rapid acceleration of computational power, data creation, and connectivity, as well as the impact of these three trends. However, the new capabilities of these technologies are only useful if humans can easily and effectively interact with them. Interfaces are critical to the success of any technology product. They collect data, facilitate user requests, and deliver the processed information back to the user. Moreover, creating interfaces that gather new and richer sets of data on their users is increasingly central to the business models of many firms.