Real Gross Domestic Product (GDP)

What Does Real Gross Domestic Product (GDP) Mean?
This inflation-adjusted measure that reflects the value of all goods and services produced in a given year, expressed in base-year prices. Often referred to as "constant-price", "inflation-corrected" GDP or "constant dollar GDP".

Investopedia explains Real Gross Domestic Product (GDP)
Unlike nominal GDP, real GDP can account for changes in the price level, and provide a more accurate figure.

Let's consider an example. Say in 2004, nominal GDP is $200 billion. However, due to an increase in the level of prices from 2000 (the base year) to 2004, real GDP is actually $170 billion. The lower real GDP reflects the price changes while nominal does not.