While money market accounts and CDs are both designed to offer higher interest rates than standard savings accounts, they are not even close when it comes to accessing money. While you have easy access to the cash in a money market account, CDs usually come in terms that can range from one month to five years or longer. You typically have to keep the money in the CD for the length of the term or face an early-withdrawal penalty. On the plus side, you can lock in a high interest rate with a CD for the full length of the term.