The Digital Engagement Model is the product of decades of interdisciplinary research and one of the earliest micro-level cognitive frameworks to explain the complexity of engagement with a variety of digital content. Grounded in theories of attention and information processing, the model reconceptualizes engagement not as the result of singular content features—such as clickbait headlines, AI tools, or video—but as a complex and dynamic process shaped by user characteristics, content structures, and technological affordances. Engagement can be maximized only when multimedia aligns to support how the human mind allocates attention, processes information, and sustains different types of interest over time. For scholars, the interface in this chapter offers a theoretical bridge between long-standing communication frameworks and the realities of today’s digital environments. For practitioners, the new interface is an applied lens for content that moves beyond linear, one-size-fits-all formats that assume all users have equal time and interest in content. In education, the model is a learning framework that explains why engagement varies across individuals and how digital content can be structured to support more meaningful interaction with information.