The fixed deposit comes to an end at the completion of its specified time period.
If the fixed deposit is with a bank then the individual would need to give instructions whether this needs to be continued.
Sometimes there are no instructions that are given and no action is taken at the time of maturity of the deposit.
In such a situation the bank will renew the fixed deposit for a similar time period as the initial deposit.
The investor would need to go later and get the updated deposit details from the bank.