Population health refers to the collective health outcomes of a group or community, taking into account various social, economic, and environmental factors that influence health. This research area focuses on understanding and improving the overall health and well-being of entire populations, rather than just individuals. It often involves studying patterns of health and disease within a population, identifying disparities in health outcomes, and developing strategies to promote health and prevent disease on a larger scale. Population health researchers may use a combination of data analysis, public health interventions, and policy changes to address health issues at the population level.