Gross domestic product
Gross domestic product (GDP) is a monetary measure of the market value of all the final goods and services produced in a period of time, often annually 
GDP (nominal) per capita does not, however, reflect differences in the cost of living and the inflation rates of the countries; therefore using a basis of GDP per capita at purchasing power parity (PPP) is arguably more useful when comparing differences in living standards between nations.
Real gross domestic product
Real GDP is an example of the distinction between real vs. nominal values in economics. Nominal gross domestic product is defined as the market value of all final goods produced in a geographical region, usually a country. That market value depends on the quantities of goods and services produced, and their respective prices.