Dollar Bill, when I look in my bankbook, there’s extra money in there. Where did that come from? I didn’t put it there. Billy, you’ve just discovered the BEST reason to keep your money in the bank! The extra money in your account is what the bank gives you for having a savings account. We call this money interest. Interest Ray can tell you all about interest. Click on the red button to meet Interest Ray. Click Here to go to the Game Room to see how much you've learned about saving money.