Analog television, which has been around for the last 50 years, is carried on a signal that fluctuates widely, creating the changes in color and brightness that make up the picture. Digital television, on the other hand, consists of a signal that has two states: on or off - just like signals inside your computer.
The result is that much more information can be carried. That allows broadcasters to transmit high-definition programming, include extra content and even broadcast multiple channels.
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