![]() Video technology was first developed for mechanical television systems, which were quickly replaced by cathode ray tube (CRT) television systems, but several new technologies for video display devices have since been invented. Analog and digital variants exist and can be carried on a variety of media, including radio broadcast, magnetic tape, optical discs, computer files, and network streaming. Video systems vary in display resolution, aspect ratio, refresh rate, color capabilities and other qualities. Video is an electronic medium for the recording, copying, playback, broadcasting, and display of movingvisualmedia.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. For other uses, see Video (disambiguation). ![]() For their content and production, see Film. This article is about the storage and reproduction medium.
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