What means Redbook Audio?

When Compact Disc technology was in the process of development, the standards for all the various things that you can do with a CD were drafted by Sony and Philips, so that there wouldn't be any confusion about incompatible standards.

The Red Book standard defines the CD-DA (Compact Disc-Digital Audio) format, which is recognised by the CD players in audio equipment. The Yellow Book defines the CD-ROM (Compact Disc-Read Only Memory) and CD-ROM XA (Compact Disc-Read Only Memory: eXtended Architecture) formats, which is used by computer equipment and games consoles. The Orange Book defines the CD-R (Compact Disc-Recordable) and CD-RW (Compact Disc-ReWritable) standards, as recognised by CD Recorders/ReWriters found in computer equipment.

There actually is physical "Red Book" that one may read in order to learn about the standard, but it must be licensed from Philips. A physical copy of the Red Book will cost you US $5000, whereas the more affordable PDF will cost you only US $200. There are similar licensing costs for the other books. It's also worth pointing out that there are several other "Rainbow Books" that define important standards. Collect the whole set!

Jam it back in, in the dark.