Function of multiplexer in communication system?

A multiplexer (MUX) in a communication system is used to combine multiple input signals into a single output signal, allowing for efficient data transmission over a shared medium. By selecting one of several input lines based on control signals, the multiplexer reduces the number of physical connections required and optimizes bandwidth usage. This function is crucial in applications like telecommunication, where it enables the integration of various data streams while minimizing interference and maximizing throughput.