As you can understand, this method of communication is not very efficient and requires more time to send/receive larger amounts of data.
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On the other hand, full-duplex is used to describe communication where both sides are able to send and receive data at the same time. In these cases, there is no danger of a collision and therefore the transfer of data is completed much faster.
Today, all networks make use of switches (rather than hubs) and UTP Ethernet cabling, which allow full-duplex communication between all connected hosts.
For more information:
View this lesson on half/full duplex communications, hubs and switches.
See SearchNetworking.com's crash course on understanding duplex conflicts.
This was first published in July 2008