The subject of Epidemiology and Disease Surveillance is about systematic investigations of health occurrences in certain populations. It involves studies related to the circumstances leading to disease emergence, disease transmission, and the ways to prevent or eliminate them. This knowledge is fundamental to public health policy making. This discipline involves gathering, interpreting, evaluating, and tracking relevant health information aimed at detecting health threats, analyzing their impact on human well-being, identifying epidemics, and evaluating various intervention tactics. The research done within this subject can help assess risks, make forecasts, and develop protective strategies for populations. The application of sophisticated analytic tools, monitoring technologies, and preventive approaches makes Epidemiology and Disease Surveillance a critical aspect of disease control.