Learn in the textbookWork Environment and Groupware
DefinitionM2M is a system in which machines send data to each other over a network and carry out monitoring and control without waiting for a person.
ExplanationM2M stands for Machine to Machine: values or states measured by one device are received by another device or computer, which then acts on them automatically. For example, an elevator's controller keeps sending its operating records to the maintenance company's computer, and when signs of trouble appear, an inspection is arranged automatically.
AnalogyLike curtains that open on their own when the alarm clock rings, one machine signals another and sets it moving.
Memory hookThe 2 in the middle sounds like "to", the same shorthand as writing B2B for trade between businesses.