What is the difference between HDI and GDP?

HDI stand for Human Develop Index and GDP for Gross Domestic Product

GDP is the market value of all final goods and services produced with in a country in a given period of time.

HDI is a summary measure of development that is published by UNDP United Nations Development program combining data on life expectancy at birth, adult literacy, educational enrollment, and average income (measured as G.D.P. per capita)