Public health ethics explores the moral dimensions of population health, balancing individual rights with collective well-being. Key concepts include autonomy, beneficence, justice, and solidarity, guiding decisions on resource allocation, research, and interventions. The field has evolved from early sanitation efforts to addressing complex issues like health disparities and global pandemics. Ethical frameworks such as utilitarianism and principlism help navigate challenges in research, practice, and emerging technologies like precision medicine and AI in healthcare.