One of the upsides to keeping your money in a bank account is the chance to earn compound interest — you earn interest on both the funds you deposit in an account and on the interest that money earns.

Compound interest can help turbocharge your savings and investments, or it can quickly lead to an unruly balance, keeping you stuck in a cycle of debt. Its magic can help you earn more — or owe more.

CNBC Select defines compound interest, how it works and ways to take advantage of it if you're looking for a new credit card ...

Compound interest is the interest earned on money that has already earned interest. Compound interest helps your money grow faster, with no additional investment on your part. Many or all of the ...