In e-mail, a carbon copy (abbreviated "cc," and sometimes "fcc" for "first carbon copy") is a copy of a note sent to an addressee other than the main addressee. A blind carbon copy is a copy sent to an addressee that is not visible to the main and carbon copy addressees. For example, you may have a work colleague that acts as a back-up when you're on vacation or not at work. You don't necessarily want the people you correspond with to know that you have a back-up. So, to keep your back-up informed, you always send the back-up a blind carbon copy. The fact that a blind carbon copy was sent is not apparent to the main and carbon copy recipients.
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The term is borrowed from the days of the mechanical and later the electronic typewriter (circa 1879-1979) when copies of typed sheets of paper were made by inserting a special sheet of inked paper called carbon paper into the typewriter. For two copies, you would insert carbon paper (sometimes just called a "carbon") between the original being typed and each of the two sheets that would become the carbon copies. Today, the term courtesy copy is sometimes used instead.