Video is an electronic medium for the recording, copying, playback, broadcasting, and display of moving visual media.[1]

Video was first developed for mechanical television systems, which were quickly replaced by cathode ray tube (CRT) systems which were later replaced by flat panel displays of several types.

Video systems vary in display resolutionaspect ratiorefresh rate, color capabilities and other qualities. Analog and digital variants exist and can be carried on a variety of media, including radio broadcastmagnetic tapeoptical discscomputer files, and network streaming.

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