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A multiplexer, often referred to as a MUX, is a fundamental digital device designed to select one input from several data sources and forward it to a single output line. This selection process is controlled by dedicated selection lines, which determine exactly which input channel should be transmitted at any given moment. In digital electronics, multiplexers function as efficient routing components that simplify complex data pathways and reduce the need for excessive wiring. They are commonly used in communication systems, processors, and memory management circuits where seamless data handling is essential.