The document provides information about population in India. It defines what a population is and notes that India's population in 2011 was estimated to be 1.21 billion. It discusses population distribution by density, with Uttar Pradesh being the most populous state. The population growth rate in India has declined to 17.64% from 2001-2011. Nearly half of India's population lives in five states. It also provides data on birth rate, death rate, age composition, sex ratio, literacy rate, and adolescent population in India. The national population policy aims to address unmet need for contraception and bring total fertility rate down by 2010.