Financial functions let you calculate things like interest, payments, and future values.
One of the most useful financial functions, the PMT function, calculates the payment for a loan based on periodic payments and a constant interest rate. For example, if you are taking out a $10,000 car loan at 8% interest and know that the loan would have to be paid off in four years, you could use the PMT function to calculate that the monthly payments for such a loan would be $244.13.