WHAT IS HALF DUPLEX AND FULL DUPLEX?

In Half Duplex data can be send to only in one direction. So It can be Describe as If data is receiving on any node of the Network then at the same time You can not send data to any other Node. This type is called Half duplex. Some example that follow half duplex mode are HUB.(but currently hub are not in use or rarely used in Ethernet.) In half duplex mode only one cable are used for both send and receive data.

In full duplex mode any Node in the Network can receive and send Data at same instant. In Full Duplex mode two cables are separately used for send and receive the data.