M2M - technical definition

(1) (Machine to Machine) The automatic communications between devices without human intervention. It often refers to a system of remote sensors that is continuously transmitting data to a central system. Agricultural weather sensing systems, automatic meter reading and RFID tags are examples.

(2) (Mobile to Machine, Mobile to Mobile) The automatic communications between mobile devices or between mobile devices and other electronic devices such as PDAs, printers and hands-free vehicle systems.