S-Video Jack

Found on DVD players, DBS receivers, Super VHS VCRs, TVs, and other kinds of A/V gear, S-video inputs and outputs use a round, 4-pin jack to pass video signals. The "S" in S-video stands for "separate": S-video connections transmit the chrominance (color) and luminance (brightness) portions of a video signal along different paths, allowing them to be processed separately.

S-video provides a sharper picture than composite video. However, component video connections yield even better performance than S-video by further dividing the chrominance portion of the video signal.