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Agreed with Mostafa Khamies Dakam. Yes simple is Simplex, CB-Radio, Walki-Talki use Half duplex, and Network and Telecommunication device mostly use Full Duplex.
There are three possible ways of data exchange.
1. Simplex: data is transmitted in one direction only. this means one end will always be a transmitter and the other end will always be a reciever.
2. Half-Duplex: data is permitted to flow in either direction, but not silmultaneously. At a given time, the transmission can take place only in one direction.
3. Full-duplex: A transmission system in which data can be transmitted in both directions simultaneously.
Simplex, Half Duplex, Full Duplex
ways of data exchange is Simplex, Half Duplex and Full Duplex
