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Are Certificates of Deposit worth it compared to investing in the stock market?
The difference is downside risk. Your CD, assuming you are in the US and the CD is purchased from a deposit bank, will be FDIC insured, your $10,000 is definitely coming back to you.  Your stock portfolio has no such guarantee and can lose money.  Your potential upside is theoretically correlated to the risk that some or all of your money may not be returned to you.