Demographics refer to the statistical characteristics of human populations, such as age, race, sex, education, income, and employment. Demographic analysis is the study of a population based on these factors. Governments, corporations, and non-government organizations use demographics to learn more about a populations characteristics for many purposes, including policy development and economic market research. Demography is the science of populations, and demographers seek to understand population dynamics by investigating three main demographic processes: birth, migration, and death. Demography is a multidisciplinary field that uses reliable data and statistical processing of these data to understand population trends and dynamics.