Virginia Demographic Survey is a form of research conducted by the Commonwealth of Virginia to collect data on the population within the state. It is conducted by the Virginia Department of Planning and Budget and provides information on Virginia residents' age, race, sex, language, education, income, occupation, and other demographics. The survey is conducted through interviews, mail surveys, telephone surveys, and online surveys. The purpose of the Virginia Demographic Survey is to accurately capture the demographic characteristics of the state's population and to provide data for the development of public policy. The survey is used to identify population trends and to provide insight into the needs of the population. The main types of Virginia Demographic Surveys are the Annual Demographic Survey (ADS), the Annual Population Survey (APS), and the Virginia Longitudinal Data System (VELDS). The ADS are conducted annually and collects data on age, race, sex, language, education, income, occupation, and other demographic variables. The APS is conducted every two years and provides a more detailed picture of the population. The VELDS collect longitudinal data over time and is used to track changes in the population.