Difference of CD-recordable to a CD-rewritable?

A CD-Recordable disc, often called CD-R, is a CD that can be recorded onto, often referred to as burning a disc, once whereas a CD-Rewritable disc, often called CD-RW, can be recorded onto many times by erasing previous material from the disc. Some CD players have problems playing CD-RWs while CD-Rs are less problematical.