Thread: Carbon Copy.

A carbon copy is a term used to refer to the CC address in e-mail. The term is a carry-over from the days when carbon copies were created for a letter needed to be sent to many people. When typing an e-mail message the To: field will contain the address of the main recipient and the CC field will contain the addresses of all the other people who will receive a copy of the message. The term has become so common in usage that nowadays it is used as verb too: "I am CC-ing the mail to you as well!"