The Human Development Index (HDI) is a statistical tool used to measure a countrys development based on its economic and social measurements. HDI is a summary measure of average achievement in key dimensions of human development, which includes three components based on which it is evaluated: education, standard of living, and health. The HDI is calculated by aggregating four metrics: life expectancy, education, expected years of schooling, and Gross National Income per capita. The education dimension is the arithmetic mean of the two education indices, mean years of schooling and expected years of schooling. The HDI is used to rank countries based on their level of development, with a higher rank allocated to countries that have performed well in all or most of the parameters. HDI acts as a measuring tool that helps in gauging socio-economic conditions of nations every year. In the context of class 10, HDI is likely taught as a measure of development and how it is calculated.