A money market account is similar to a savings account, with a few differences. Most banks will require that you keep a certain amount in your account otherwise you will be charged a fee for going below. you can deposit and withdraw money as you wish, most banks will have a maximum as too how many withdraws you can make a month. You may also have a fee for each withdraw as well. The money you do have in your account will accumulate interest, so the real purpose is to keep adding money and leave it be so that you gain more from it.