The document discusses the modern definition and key aspects of conducting a census. It notes that a census involves collecting, compiling, evaluating, analyzing and publishing demographic, economic and social data for an entire population within a country or region. It highlights some important features of censuses including individual enumeration, universality within a defined territory, simultaneity, and defined periodicity. The document also outlines some common uses of census data and the roles and responsibilities of different government agencies involved in conducting a census in India.