Genetic epidemiology is a field of study that combines principles of epidemiology and genetics to investigate how genetic factors influence the risk of developing diseases or health conditions within populations. Researchers in this field study the distribution and determinants of genetic variations within populations, as well as how these variations interact with environmental factors to impact disease risk. By studying the genetic basis of diseases, researchers can identify genetic risk factors, develop genetic tests for disease susceptibility, and ultimately inform strategies for disease prevention and treatment.