Gini index or coefficient, named after Italian statistician Corrado Gini, is a measure of statistical dispersion used to determine inequality among values of a frequency distribution. It can be used to measure the inequality of any distribution. Here a Gini index of 100 indicates perfect inequality, and 0 (zero) indicates perfect equality. It is a widely used indicator of income inequality or wealth concentration within an economy or society. It indicates how far the distribution of income among individuals (or households) deviates from a perfectly egalitarian distribution.