What do you mean by duplex mode? Write its types

Duplex communication means communication mode that allows transmitting information from both direction. An ordinary telephone communication is a duplex communication. The types of duplex mode are 

1. Full duplex
2. Half duplex
   
   Full duplex
   

   Full duplex transmission means that data can be sending in both the directions as it is bidirectional at the same time in other words, data can be sent in both directions simultaneously.

   for example, Telephone Network in which there is communication between two persons by a telephone line, using which both can talk and listen at the same time.
   In full duplex system there can be two lines one for sending the data and the other for receiving data.
   
   Half duplex

   Half-duplex data transmission means that data can be transmitted in both directions on a signal carrier, but not at the same time.

   For example, on a local area network using a technology that has half-duplex transmission, one workstation can send data on the line and then immediately receive data on the line from the same direction in which data was just transmitted. Hence half-duplex transmission implies a bidirectional line (one that can carry data in both directions) but data can be sent in only one direction at a time.

   Example of half duplex is a walkie- talkie in which message is sent one at a time but messages are sent in both the directions.