Real GDP and Nominal GDP are two measures of a country's economic performance. Nominal GDP is the total value of all goods and services produced in a country during a given period, usually a year, using current prices. Real GDP, on the other hand, is the total value of all goods and services produced in a country during a given period, usually a year, using constant prices.

The difference between real GDP and nominal GDP is that real GDP takes into account inflation, while nominal GDP does not. In other words, real GDP is adjusted for changes in the price level, while nominal GDP is not. This means that real GDP is a more accurate measure of a country's economic growth, as it reflects changes in the quantity of goods and services produced, rather than changes in prices.

For example, if a country's nominal GDP increased by 5% over a year, but inflation was 3%, the real GDP would only have increased by 2%. This is because the increase in nominal GDP is partly due to the increase in prices, rather than an increase in the quantity of goods and services produced.

In summary, nominal GDP is the total value of all goods and services produced in a country using current prices, while real GDP is the total value of all goods and services produced in a country using constant prices, adjusted for inflation. Real GDP is a more accurate measure of a country's economic growth, as it reflects changes in the quantity of goods and services produced, rather than changes in prices.