Define real and nominal GDP. Which form of GDP (real or nominal) do you believe should be utilized when assessing the performance of the US economy

Define real and nominal GDP. Which form of GDP (real or nominal) do you believe should be utilized when assessing the performance of the US economy over time? Why? Locate GDP data and provide a link to your source. Given this information, how do you think the US is doing with respect to GDP? Explain your answer.