2. M achine to Machine (m2m) Machine-to-machine communication, or M2M, is exactly as it sounds: two machines “communicating,” or exchanging data, without human interfacing or interaction. This includes serial connection, powerline connection (PLC), or wireless communications in the industrial Internet of Things (IoT). Examples of M2M communication in this case would be vending machines sending out inventory information or ATM machines getting authorization to despense cash. M2M can refer to any two machines—wired or wireless—communicating with one another. machine-to-machine communication makes the Internet of Things possible. M2M is among the fastest-growing types of connected device technologies in the market right now, largely because M2M technologies can connect millions of devices within a single network.