CAN-Bus, Function

Bus: In electronics, a bus is a system used to transport or distribute data.

CAN: The Controller Area Network (CAN) is a bus system that uses two wires called bus lines. Two bus lines are used to detect malfunctions in the lines. Data is transferred to the connected control modules in series (one after the other) across the bus lines.
These control modules communicate with each other via the CAN-bus.