What is a primary use of time-division multiplexing in communications?

Time-division multiplexing (TDM) is primarily used to efficiently share a communication channel among multiple signals. In TDM, each signal is allocated a specific time slot within the channel, allowing multiple signals to be transmitted over the same medium without interference. This method is particularly useful in systems where bandwidth is limited, as it optimizes the use of available channel capacity by ensuring that multiple data streams can coexist without overlap.

By dividing the transmission time into segments and assigning each signal a unique time slot, TDM enables a single transmission medium to carry various types of data simultaneously. This capability is essential in telecommunication systems, where many different conversations or data streams need to be transmitted over a single line. Therefore, TDM contributes greatly to the efficiency and effectiveness of communication systems, making it a vital technique in modern digital communications.