The returns of a fixed deposit are guaranteed. Here are the significant ones: 1. Assured Returns To know what is a fixed deposit clearly, you need to know its prime features. If you want to, you have to pay a penalty. You are not allowed to withdraw the money before the maturity. The interest you earn is either paid at maturity or on periodic basis depending on your choice. When you open a fixed deposit account at a specific interest rate, it is guaranteed, for the rate of interest remains the same, irrespective of any changes, which happen due to market fluctuations. This is why an FD is sometimes called a term deposit. You can choose a fixed deposit for a period ranging from minimum 7-14 days to maximum 10 years. Banks offers different rates of interest for a fixed deposit account. At the end of the tenure, you receive the lump sum, along with an interest, which is a good money-saving plan. With an FD account, you can invest a sizeable amount of money at a predetermined rate of interest for a fixed period. A fixed deposit, also known as an FD, is an investment instrument offered by banks, as well as non-banking financial companies (NBFC) to their customers to help them save money.