Demography refers to various statistics describing a population, such as size, rate of change, urbanisation, household size and family composition.
The key components of population change (fertility, mortality and migration) are measured separately.
Migration data captures the movement of people from one area to another. Migration can be measured by flow (arrivals, departures or net migration), type (international or internal) and nature (short-term, long-term or permanent). Data on labour migration is often captured separately.