Fixed Deposits (FDs) are a common financial instrument offered by most banks and non-banking financial institutions (NBFCs). It is also referred to as a 'term deposit.' You can invest a specific amount of money in an FD for a set period at a specific interest rate, and receive your investment amount at maturity. 

The interest rate depends on the FD provider and the tenure. FDs are available for various durations, from as short as 7 to 14 days to as long as 10 years.