it determines how much they charge you in interest if you carry a balance. Lower is better. The percentage interest is what they charge you each month, “annual percentage rate” is what you’re paying if you keep that balance for a year. It’s slightly different because in that year, you’re also paying interest on the amount of interest (compound interest) you owe in the previous months.
Not carrying a balance means that you don’t pay interest.
p.s
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