What is the difference between a digital video signal and an analog video signal?

Example: HDMI uses a digital signal and component uses an analog signal, but what does all this mean?

In component, the level of tension varies with the content image. bright picture, a lot of tension, dark image, low voltage. This is done for each of the three color channels. Digital has only two voltage levels one for the other mark is a space, that changing a data rate predermined. Can not find the brightness of the image should that by measuring the voltage on the line. The brightness is encoded as a digital data stream.

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