SSL and TLS are cryptographic protocols that secure communication over networks. They provide encryption, authentication, and data integrity, protecting IoT devices from eavesdropping and tampering. TLS, the successor to SSL, is the standard for secure internet communication today. In IoT, SSL/TLS is often used with protocols like HTTPS or MQTT over TLS to protect sensitive data. While secure, encryption requires processing power and may challenge low-power IoT devices. Nevertheless, implementing SSL/TLS is crucial for building trust and ensuring safe device-to-device communication.