This video explains the concept of social determinants of health, highlighting that significant health inequalities, both within and between countries, are not primarily caused by a lack of healthcare access. Instead, they stem from inequities in the conditions where people are born, grow, live, work, and age, driven by imbalances in power, money, and resources. The video argues that health professionals should care about these social determinants because addressing them is crucial for improving individual and population health and is a matter of social justice.