Half-duplex systems allow two-way exchanges but signals can only flow in one direction at a time, like walkie-talkies and police radios. In the case of full-duplex systems, signals can flow in both directions at the same time, like regular telephone and internet.
Half-duplex systems allow for communication in both directions, but only one signal can be transmitted at a time, similar to walkie-talkies and police radios. In contrast, full-duplex systems enable simultaneous two-way communication like regular phones and the internet.