Where you save your money often depends on what you are saving for.If you are saving to buy a book or to go to a concert,then you would probably keep your money somewhere in your room. If you are saving for a big purchase like a mountain bike or a washing machine, where would you save your money? One place to save money is a bank. If you put your money in a piggy bank(猪形储蓄罐),one year later you'll still have the same amount of money as you put in. If you put your money in a savings account,one year later,you'll have more money than you put in. Why? When you keep your money in a bank,your money earns interest. Interest is an amount of money a bank pays you to use your money. The bank uses your money (and the money of other people,too) to lend to its customers and businesses. The bank will send you a statement several times a year. A bank statement tells you how much money you have in your account and how much interest you have earned. If you leave your money in the bank,you can watch it grow! Another way you can save money is to buy a certificate of deposit or CD. If you have some money that you don't need to use for a long time,this is a good way to make your money grow. You can buy a CD at a bank. You agree not to use the money for a certain period of time. That period might be from six months to five years. You can't touch your money during that time. If you do,you must pay a penalty(罚款),or fee.