The National Family Health Survey (NFHS) in India is a large-scale, multi-round survey conducted to collect essential information on population, health, and nutrition. It is a critical source of data for policymakers, researchers, and program planners in the field of health and development. The NFHS provides insights into family health indicators such as fertility, mortality, reproductive health, maternal and child health, nutrition, immunization, family planning, and health service utilization. It also gathers data on socio-economic, demographic, and environmental factors affecting health outcomes, enabling a comprehensive understanding of the health status of the population. The primary objectives of the NFHS are to generate reliable and representative data on population health and nutrition, assess trends over time, and inform the formulation, implementation, and evaluation of health policies and programs. Specifically, the survey aims to provide information on fertility patterns, contraceptive use, maternal and child health care, nutritional status, reproductive health, and health service coverage. It also seeks to monitor progress toward national and international health targets, such as the Sustainable Development Goals (SDGs), and identify disparities across states, regions, and socio-economic groups. The survey design of NFHS is carefully