The census of population in India is conducted every 10 years. This means that the government collects data on the population, demographic characteristics, and other relevant information of all individuals residing in India once every decade. The purpose of the census is to provide accurate and up-to-date information about the population, which is essential for effective planning and policy-making. It helps the government understand the social, economic, and cultural trends of the country, and assists in resource allocation and development initiatives. The last census in India was conducted in 2011, and the next one is scheduled for 2021. It is important to note that conducting the census every 10 years allows for sufficient time to compile and analyze the massive amount of data collected.