The APR (Annual Percentage Rate) is a simple nominal interest rate representing annual interest accrued.  APR is the base rate that allows linear compounding period after period
Periodic Rate = APR / n
When n = Frequency of compounding within a year

APR is used in the context of costs: i.e. Inflation rate, interest rate on debt.

If the frequency of compounding is annual, then APR will be the same as the APY.

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