What is the difference between analogue and digital video?
With analog video, light and sound are captured and recorded as electrical signals, transmitted as waves that can be represented by the up and down movement of a line. These signals look like mountain peaks and valleys, with variations in the height of the mountain and the depths of the valley, and variations in the distances between peaks and between valleys. With light, those variations are the differences between dark and very bright, as well as colors; and with audio, the differences are between no audible sound and very loud sound.
