The technology that allows for secure online communications is primarily the Secure Sockets Layer (SSL) and its successor, Transport Layer Security (TLS). These protocols encrypt data transmitted over the internet, ensuring that sensitive information—such as personal details and financial transactions—remains confidential and protected from eavesdroppers. SSL/TLS creates a secure communication channel between clients and servers, establishing trust through digital certificates. This technology is essential for e-commerce, online banking, and any service requiring secure data exchange in today's internet landscape.