What does channel multiplexing mean?

1 Why do you want to use multiplexing technology? Let me tell you: three couples meet on both sides of a river, women to men, women to men, and women to men. In this case, you have to build three bridges! Stupid, isn't it? This is the disadvantage that it cannot be reused. You just need to build a bridge and use it together. That's why you want to reuse it. The basic classification of multiplexing technology is frequency division multiplexing (the same time occupies different frequency bands and bandwidths, but we can still toss with that multiplexing bridge. Although it is a bridge, we can think that it is divided into three roads, so that three couples can walk side by side to the beautiful woman crossing the bridge at the same time.) Time division multiplexing (not occupying all frequency band loans at the same time, that is to say, these three handsome guys should discuss well and cannot walk side by side.