The technology often used for secure online transactions is cryptography, particularly through Secure Socket Layer (SSL) or Transport Layer Security (TLS) protocols. These protocols encrypt data exchanged between the user's browser and the server, ensuring that sensitive information like credit card numbers and personal data remains confidential and protected from eavesdroppers. Utilizing cryptographic technology helps establish trust and security in online environments. Secure payment gateways further validate the legitimacy of online transactions, reinforcing the importance of cybersecurity in e-commerce.