APR stands for Annual Percentage Rate. APR is how your interest is calculated on credit cards and personal, student, home, and auto loans. This is broken down by a simple interest rate of the period of a year.
APY stands for Annual Percentage Yield. APY is used to calculate your interest on savings, checking, CDs, and IRA accounts. This type of interest takes compounding, or building interest using interest, into account. When looking at an APR for a savings account, the higher the better. You are more likely to find a higher interest with a CD than a regular savings account.