Image via WikipediaQ: What is the difference between CD+R and CD-R?
A: There is no such thing as CD+R. CD-R is CD-Recordable, which means you can write ONCE to it.
DVD recordable have two standards: DVD-R and DVD+R, but there are really no practical difference between them to the consumer, and most if not all drives will read/write both with no practical difference.
So again, there is no such thing as CD+R. Someone was very confused and assumed that since DVD recordable have two versions: +R and -R, CD recordable must have two versions as well. That is simply not true.
There is something called CD+G, but that's basically some graphics recorded on audio CDs (G = Graphics), and playable on some special screen-equipped audio-CD players.