1. Public health is an interdisciplinary concept that reflects the interaction between biological health and society. It is a multidimensional, two-component system with mass characteristics. 2. Public health can be measured using various indicators related to health needs, health activities, and health relations in a population. Valid indicators of public health should be measurable, reliable, sensitive, specific, applicable, and relevant. 3. There are different types of public health indicators including rates, ratios, and proportions to assess demographic characteristics, disease processes, physical health status, and social/environmental factors that influence population health. Both static and dynamic indicators are used.