A certificate of deposit lets you earn interest on a sum of money with a fixed annual percentage yield, or APY, over a fixed period of time, or term. CDs are a good savings option to park money for a few months or years with minimal risk of losing your earnings.

If you need to access the money before it fully matures, you’ll often pay an early withdrawal penalty that can reduce your interest earnings. Most CD options require a single deposit and don’t allow additional deposits, so you’ll need to gather your funds before opening an account. When you’re ready to open a CD, compare the best terms and rates among local credit unions and banks to find the right fit for your savings.