Geodemography is the study of people based on where they live.; it links the sciences of demography, the study of human population dynamics, and geography, the study of the locational and spatial variation of both physical and human phenomena on Earth, along with sociology. It includes the application of geodemographic classifications for business, social research and public policy but has a parallel history in academic research seeking to understand the processes by which settlements (notably, cities) evolve and neighborhoods are formed.Geodemographic systems estimate the most probable characteristics of people based on the pooled profile of all people living in a small area near a particular address.