You can shout out in a room full of people and all of them can hear you. However, trying to hold an individual, private conversation with each and every person in the room, at the same time, is far, far more complicated.
Broadcasting satellite TV is the same thing–send out a signal, and the same signal can be “heard” by millions of receivers. But in order to have millions of homes sending and receiving *different* data all day long requires a whole lot of computer-processing power and a whole lot of individual signals.
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