Explores the theoretical frameworks and core principles underlying precision health approaches to healthcare innovation. Examines how individual variability in genetics, environment, and lifestyle influences disease prevention, diagnosis, and treatment strategies. Integrates perspectives from genomics, data science, ethics, and health systems. Introduces biological bases of variation, computational approaches to health data, and societal dimensions of precision medicine implementation. Addresses economic factors that shape precision health adoption. Emphasizes key concepts, providing foundational knowledge for evaluating and participating in precision health initiatives across healthcare, research, and policy contexts.