Explain the three main types of bank accounts and their purposes.

The three main types of bank accounts are savings accounts, current accounts, and fixed deposit accounts. Savings accounts are for individuals who save regularly and earn interest, though there are limits on monthly withdrawals. Current accounts are for businesses and traders who often make and receive payments, don't earn interest, and have no withdrawal limits. Fixed deposit accounts involve a one-time deposit kept for a fixed period, like three or five years, after which the bank returns the original amount plus higher interest than savings accounts offer.