Unlike normal savings accounts, IRA plans don't pay out a specific return or interest rate. When you put money in your IRA, you have to choose an investment otherwise the money will simply be sitting as cash, and this is not ideal for a goal like retirement.
Most IRA companies offer a wide range of choices for investments and this can include bonds, stocks, or mutual funds. If you are not familiar with the differences or not sure what to choose, opt for a r that can handle your investments on your behalf, for a minimal fee.