In electronics, direct coupling or DC coupling (also called conductive coupling[1]) is the transfer of electrical energy by means of physical contact via a conductive medium, in contrast to inductive coupling and capacitive coupling. It is a way of interconnecting two circuits such that, in addition to transferring the AC signal (or information), the first stage[clarification needed] also provides DC bias to the next. Thus, DC blocking capacitors are not used or needed to interconnect the circuits.