what is "redbook"?

I have been reading some forums here recently and have seen people writing about 'redbook cds'-Can anyone tell me exactly what that is?
thx

jim_gerace07-13-2001 4:05pm

kjg Details Discussions Posts This discussion Message User 171 posts 07-14-2001 at 04:23pm Copy Comment URL Report Comment Edit Delete Thank you as well. We really need an audio glossary on this site :-). Ken