Demography is the mathematical study of human and animal populations – their size, composition and distribution across space – and the process through which populations change. Births, deaths and migration are the ‘big three’ of demography, jointly producing population stability or change. It is especially relevant to the study of maximum human lifespan.
With regard to the state of the population, demography examines, for example, the size of the population, the age, gender and marital status structure, and the regional distribution. In addition, the state of the population can be described by, inter alia, citizenship, language, religion, ethnic group, country and country of birth, education, occupation and occupation.
Demographic change events include births, deaths, relocations, and marital changes, that is, marriages and the strengthening, divorce, and widowhood of registered partnerships. These events can change the view of various factors such as age, gender, or the marriage of the end of the duration.
In addition, demography studies the interplay between these phenomena and their connection to economic and social life.
Classical demography refers to demographic research that focuses solely on demographic factors and their interrelationships. It is a closed approach as it does not take other factors into account. Demography is when classical demography interdisciplinary incorporates perspectives and explanatory models from other disciplines, such as the social sciences or natural sciences, to try to gain an understanding of demographic phenomena.
Population survey data sources include demographic statistics, censuses, interview surveys and population registers.