Now, I am somewhat lazy, otherwise I'd horribly draw you a demultiplexer as well. You should be able to imagine it (the single output of multiplexer as one input to a series of AND gates, selected by a decoder circuit). This allows us to have an "omnibus," or "bus" for short. The idea, then is that you can have a series of things connected together over a smaller number of wires (much like a bunch of people sitting in the vehicle referred to as a "bus"). It's the combination of both that allows us to send data from a bunch of wires through a smalle number of wires, back to a larger number of wires. Since the S-pins (wires marked S for Selection) don't have to be of the same size on both ends, this also allows us to take input and shove it into a larger number of outputs, or take a larger number of inputs and shove it into a smaller amount of outputs. There's one small problem, though: only one thing can be selected at a time. So, you can't use this to get away with trying to, say, speed up your internet connection or something. Now, a nifty little thing you can do is make a grid of switches and use this and some OR gates (to keep power going) to make a basic keyboard out of switches instead of buttons. The reason you'd have to do this, is because you still don't know how to "store" the output of a calculation. So, to make a proper keyboard (as well as a bunch of other things), you'll learn about that next.

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