Why are Super VHS (S-VHS) video cassettes better in quality than VHS cassettes?

Super VHS (S-VHS) video tape is formulated to give the highest quality, ultimate image resolution, picture and sound quality in the VHS format. S-VHS tape is designed for use with S-VHS VCR's, digital satellite broadcasts and editing and mastering applications. S-VHS video cassettes are recommended for use in VCR's bearing the S-VHS trademark for the optimum picture quality. S-VHS cassettes recorded in the S-VHS mode cannot be played back with conventional VHS VCR's