Multiplexing is a technique used in data communication and networking that allows multiple signals or data streams to travel over a single communication channel. This allows for more efficient use of resources and increased capacity for transmitting data. Multiplexing can be achieved through various methods, such as time-division multiplexing (TDM), frequency-division multiplexing (FDM), wavelength-division multiplexing (WDM), and code-division multiplexing (CDM). Multiplexing is commonly used in telecommunications, broadcasting, and networking to maximize the use of available bandwidth and improve overall efficiency of data transmission.