Start saving with a certificates of deposit, or CD. Investors stow money in a CD for a number of years, usually for 1, 5, 10, or 25 years, during which time the investor cannot access the funds. The longer the CD, the higher the interest rate. CDs are offered by banks, brokerage firms and independent salespeople, and are low-risk but offer very limited liquidity. CDs are most useful as a hedge against inflation, especially if your cash is just sitting around.