A new cognitive model for digital engagement deserves its own chapter on how the human mind processes digital information. This chapter integrates research from communication, cognitive psychology, and neuroscience to explain why sustaining attention in digital environments cannot be reduced to exposure or initial attraction. It examines how content structure, interactivity, and reward mechanisms interact with attentional systems—particularly in mobile and social contexts where choice is constant, and attention is fragile. By framing engagement as a dynamic cognitive process rather than a momentary response, the chapter establishes the theoretical foundation for the Digital Engagement Model and sets the stage for examining how content can be designed to align with the brain’s processing of digital information.