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CDR means compact disc-recordable. Like most compact discs, CDRs can only store somewhere between 700-800MB of data. The unique thing about them is that they can only be used for recording once. After that, it is a read-only disc. As such, whatever you will record on a CDR will remain unchanged forever.
This also added the DVD-RW format and it is official known as a re-recordable disc, not a re-writable disc. Many Compaq, Packard Bell, Apple and Sony computers shipped DVD-R General drives in 2001 and early 2002, as the DVD+R format was not yet available and the DVD-R format thrived without any kind of competition.