TLS (Transport Layer Security) is the most widely used protocol for key exchange in secure communications. It’s commonly used for securing web traffic, email communication, and many other applications. While SSH (Secure Shell) is prevalent for secure remote access and IPSec is widely used for VPNs, TLS’s versatility makes it the de facto standard for encrypting data in transit over the internet, ensuring the confidentiality and integrity of a wide range of online interactions.