This document presents on the topic of the Human Development Index (HDI). It defines human development as the overall growth and quality of life for people in a country, as measured by the HDI. The HDI is a statistic composite index that considers life expectancy, education, and income to rank countries into four tiers of human development. The document discusses the pillars of human development, how the HDI is calculated, India's ranking in the HDI, advantages of using the HDI, and how the HDI relates to sustainability.