Electronic payment systems allow for paperless monetary transactions through various modes like credit cards, debit cards, smart cards, and electronic funds transfers. Credit cards involve a bank issuing a customer a small plastic card linked to an account, where the bank pays merchants on the customer's behalf and the customer pays the bank later. Debit cards are similarly linked to a bank account, but funds are deducted immediately during transactions. Smart cards contain microchips that can store payment information and balances in an encrypted format, providing security. Electronic funds transfers allow money transfers between bank accounts electronically without physical cash or checks.