A daisy chain is a wiring scheme in which hardware devices are connected together in sequence.

For example, when connecting devices A, B, and C, as a daisy chain, devices are connected in sequence, A to B and B to C like a bus wiring. Generally, the very end device is connected to a termination resistor or a terminal unit. All devices may receive the same signal, but unlikely to a bus wiring, any device in the chain may alter the contents before it sends one or more signals to another device.