It's kind of funny that a software application would use abbreviations that refer to pre-software days. Remember carbon copies? Cc means carbon copy and Bcc means blind carbon copy. For emailing, you use Cc when you want to copy others publicly, and Bcc when you want to do it privately. Any recipients on the Bcc line of an email are not visible to others on the email. These five tips get beginners started and provide info for those who already know how to use Bcc.