The technology used to protect personal information online through encryption is commonly based on protocols like SSL/TLS (Secure Sockets Layer/Transport Layer Security). These protocols encrypt data transmitted between users and websites, ensuring that sensitive information, such as credit card numbers and personal details, remain confidential. Another significant method involves the use of asymmetric encryption, where a pair of keys (public and private) is employed to secure messages. This technology helps prevent unauthorized access to data during transmission and supports secure online communications across various platforms, contributing to enhanced data privacy for users.