Duduli

A demultiplexer is a combinational logic circuit which receives a single input & distributes it over several output line. Hence a demultiplexer is also known as a distributor since it transmits the single data to different destination.

A multiplexer is a combinational logic circuit which receives several data inputs & selects only one out of them to get through to the output. A multiplexer is also known as a data selector since it selects one out of many inputs & directs the selected input to the output.