This session from Yale's Introduction to Medical Software course turns from engineering topics to the business forces behind digital health. The instructor walks through five drivers reshaping the field: patients taking more control of their own care, the rise of digital therapeutics as a treatment category, continuous data streams from wearable biomarkers, the surge of venture capital chasing health tech startups, and regulatory frameworks such as FDA pathways that shape what can reach the market. Examples illustrate how these forces interact, showing why a promising algorithm still needs funding, regulatory clearance, and patient buy-in to become a real product. The lecture functions as an orientation to the digital health ecosystem rather than a deep technical dive, aimed at students who need to understand why the field is growing and who is paying for that growth. It runs about twelve minutes and sets up later lessons on regulation and deployment.