This is a higher standard of video tape recorder, which approximately doubles the amount of horizontal resolution able to be recorded on video tape (from around 250 lines for VHS to around 400 lines). It also uses the S-Video system of keeping the colour and luminance parts of the video signal separate, allowing better picture quality. It typically requires an S-VHS tape, which is identical to a standard VHS tape but with better quality magnetic formulation. These tapes sell at quite a premium over regular tapes. The term is sometimes erroneously used (even by equipment makers, who should know better!) for S-Video.