A population is a group of individuals of the same species living in the same region and interbreeding. Members of a population frequently rely on the same resources, face comparable environmental constraints, and rely on the availability of other members to survive in the long run. Population science is a research discipline that aims to have a significant impact on public health and clinical practise by lowering disease risk, incidence, and death, as well as improving people's quality of life. Population science examines the complete spectrum of factors that can influence health outcomes. Health care, individual health behaviours, environmental variables, social and economic factors, policies, and genetic determinants of health are all some of these health factors. Physical, mental, behavioural, and social health outcomes all contribute to a better knowledge of health.