Devices communicate with each other by sending and receiving data. The data can flow between the two devices in the following ways.
1. Simplex Mode
In simplex mode, communication is unidirectional. Only one of the devices sends the data and the other one only receives the data.
A CPU send data while a monitor only receive data.
2. Half Duplex Mode
In half duplex mode both the stations can transmit as well as receive but not at the same time. When one device is sending other can only receive and vice-versa.
Example : walkie-talkie
3. Full-Duplex Mode
In the full duplex mode, both stations can transmit and recieve at the same time.
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