A logic circuit that may be considered as a
single-pole multiway switch whose output is determined by the position of the
switch wiper. The wiper position is controlled by a select signal,
normally digital, that indicates which of the inputs is to be connected to the
output. In this way a number of channels of data may be placed sequentially on a
time-shared output bus under the control of the select signal, a process known
as time-division multiplexing. Inputs to and outputs from a multiplexer may be
in digital or analog form. See also decoder/demultiplexer.