M2M is short for machine-to-machine, which means machine-to-machine, and is also understood as man-to-machine, machine-to-man, etc. It aims to realize intelligent, interactive and seamless connection among people, machines and systems through communication technologies.
M2M devices are devices that can answer requests for data contained in a number of devices or can automatically transmit data contained in those devices.
M2M communications shares the core concept of the Internet of Things (IoT), with the difference being that the concept of IoT, the technologies it employs, and the scenarios in which it is used are broader. M2M, on the other hand, focuses on wireless communication network applications and is a major way of applying IoT.
The M2M application system consists of intelligent machines, M2M hardware, communication networks, and middleware, and the M2M application areas are: home applications, industrial applications, retail and payment, logistics and transportation, and healthcare.