A multiplexer (MUX) is a combinational logic circuit that selects one input from multiple input signals and forwards it to a single output line. This digital switch enables the transmission of several signals over a single data line, making it an essential device in communication systems and digital circuits.

How a Multiplexer Works
A multiplexer operates using selection lines that determine which input signal is routed to the output. The number of selection lines depends on the number of inputs. For instance, a 4-to-1 multiplexer requires two selection lines to choose from four inputs. Internally, the circuit uses logic gates to implement this selection process, ensuring that only the chosen input is passed to the output at any given time.
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