Suppose you want to buy a car valued at $750,000 in 15 years, and the prevailing interest rate is 5.5, how much do you have today in order to buy the car in 15 years?

This is what we call Present Value. It is the current value of future cash flows discounted at the appropriate discount rate. It is calculated by dividing the Future Value (expected amount in the future) by the Discounting Factor.
This value means that given that interest rate is constant 6.5% over 15 years, we will earn 10,000 if we have 3,888.265 to invest today.