What is HD (Half duplex)?

Half-Duplex (HDX) is an activity wherein transmission among two terminals happens one or the other way but in only one direction at a time. An example of a half-duplex device is a walkie-talkie which has a press-to-talk button. At the point when the local user presses this button, they need to speak to the remote person, which turns on the transmitter and turns off the receiver, preventing them from hearing the remote person while talking. User releases the button to listen to the remote person, which turns on the receiver and turns off the transmitter.