What is the primary function of a multiplexer in digital electronics?

The primary function of a multiplexer, also known as a data selector, is to choose one of several input signals and forward the selected input into a single line output. This allows multiple data sources to be directed to a single output channel, effectively combining multiple inputs without the need for additional circuitry.

A multiplexer operates based on selection lines that determine which input is connected to the output. By adjusting these selection lines, the system can dynamically choose between different data signals, providing a flexible means to manage multiple data pathways efficiently.

This functionality is crucial in digital systems where multiple data sources need to be managed and transmitted over limited communication lines or shared resources. The ability to select and route data accurately makes multiplexers essential components in various applications, including communication systems, data routing, and signal processing.