M2M (Machine-to-Machine) communication refers to the seamless exchange of data between devices without the need for human intervention.

• Communication between physical objects or devices, primarily for monitoring and control.
• In the context of IoT, M2M plays a crucial role in enabling devices to communicate and collaborate intelligently.
• How it works: each machine embeds a smart device to sense data, perform computations, and communicate using protocols like 6LoWPAN, LWM2M, MQTT, and XMPP.

Example — Industrial Assembly Line: A robotic arm (Machine A) senses a task is complete and sends a signal directly to the conveyor belt (Machine B) to move the next part forward — all without human intervention.