<communications> Used to describe a communications channel that can carry signals in both directions, in contrast to a simplex
channel which only ever carries a signal in one direction.
If signals can only flow in one direction at a time the communications is "half-duplex
", like a single-lane road with traffic lights at each end.
Walkie-talkies with a "press-to-talk" button provide half-duplex communications.
If signals can flow in both directions simultaneously the communications is "full-duplex
", like a normal two-lane road.
Telephones provide full-duplex communications.
The term "duplex" was first used in wireless, telegraph, and telephone communications.
Nearly all communications circuits used by computers are two-way, so the term is seldom used.