VCR - technical definition

(VideoCassette Recorder) A videotape recording and playback machine that houses both supply and takeup reels of tape in a convenient removable package. The most ubiquitous VCR format is the 1/2" VHS tape, which has been widely used for entertainment and training. One inch videocassettes are used for mastering video recordings, and Sony's 3/4" Umatic videocassettes were widely used in corporate training before VHS tapes became popular. See Betamax, VHS and VTR.