Fixed Deposits are one of the best investment avenues for those looking for an assured return. A Fixed Deposit is a type of an account opened with a bank where an assured rate of interest is paid for keeping the funds for a particular period. Fixed Deposits are an easy way to earn returns from funds that are lying idle. But, how does Fixed Deposit work and why does the bank pay a higher rate of interest on these deposits? This handy guide will help you understand.