Single-channel video is a video art work using a single electronic source, presented and exhibited from one playback device. Electronic sources can be any format of video tape, DVDs or computer-generated moving images utilizing the applicable playback device (such as a VCR, DVD player or computer) and exhibited using a television monitor, projection or other screen-based device. Historically, video art was limited to unedited video tape footage displayed on a television monitor in a gallery and was conceptually contrasted with both broadcast television and film projections in theatres. As technology advanced, the ability to edit and display video art provided more variations and multi-channel video works became possible as did multi-channel and multi-layered video installations. However, single-channel video works continue to be produced for a variety of aesthetic and conceptual reasons and the term usually now refers to a single image on a monitor or projection, regardless of image source or production.