The internal data bus does this (there may be more than one depending on the architecture).
A subsystem that transfers data between components inside a computer.
A bus consists of wires which is used to transfer data either in serial or parallel transmission.
In computer architecture, a bus is a communication system that transfers data between components inside a computer, or between computers. Source: Wikipedia Regards Techvedic........A Technical Support Firm
Inside a computer, a bus transfers data between components. A bus is thought of as being the physical wires that make the connection, but these days the software that controls data transfer is also thought of as part of the bus.
Components
cars
electrons
fuel
What the component inside TCU when D4 blinkking.
Components inside Computer (CPU) are Motherboard, Processor, RAM, Harddisk drive, Optical Media drive, SMPS etc.
heat It transfers engine heat from the coolant to the air inside the car.
processor