It is the abbreviation of the word "CarbonCopy". The origin of CC comes from the era of mechanical typewriters. At that time, documents were copied on carbon paper, so this expression has been used all the time. When it comes to cc, it's time to say bcc, which is a kind of "cc" that pays more attention to confidentiality. BCC is the abbreviation of "BlindCarbonCopy", which is also the "secret cc" function.

When you choose BCC to send an e-mail, the sender usually doesn't want the recipient to see who the e-mail is copied to. If you skillfully use bcc, you can keep communication records and avoid unnecessary trouble. When expressing personal opinions, adding an IMHO will be more modest and rigorous.

If you see the letter NB in the email, be sure to pay close attention. Because NB=NotaBene, this is an expression derived from Latin, which means "special attention and concern"