Comprehensive Annual Modular Survey (CAMS) collects data to generate indicators encompassing education, out-of-pocket medical expenditure, use of mobile and internet, financial inclusion, ICT skills, possession of assets, etc. In addition, information related to drinking water, sanitation, energy use, birth registration, access to transport facilities, etc., was also collected. The survey collected both household and person-level information. CAMS, 2021 is designed to collect information required to generate some important socio-economic indicators, demands for which has increased significantly during past few years.