Explain multiplexers

What will be an ideal response?

In a typical network, most devices are not in constant communication with other devices. Someone sitting at a typical networked computer is not constantly pressing the Send button or Receive button every 10 seconds to do their work. Instead, most users of these devices only need to send or receive a communication once in a while, not constantly. Therefore, having point-to-point circuit configurations for all devices is not only expensive, because of wiring and other hardware costs, but inefficient as well. Point to-point circuits should be reserved for devices that require a dedicated link because their communication needs demand it. A pair of multiplexers will, for example, need to be connected by a single link. Multiplexers are devices that let other, slower devices share a higher-speed circuit. Sharing a high-speed circuit is more efficient in terms of utilizing that circuit's capacity.