A Public Health Data Science job involves using data analysis, statistical modeling, and programming to study health trends, identify risk factors, and inform public health policies. Professionals in this field work with large datasets from sources like hospitals, public health agencies, and research studies to monitor diseases, improve healthcare interventions, and guide decision-making. They often use tools like Python, R, and SQL for data processing and visualization. Their work supports disease surveillance, health equity analysis, and policy evaluation to improve population health outcomes.