In e-mail terminology, Cc stands for "carbon copy" and Bcc stands for "Blind carbon copy". The difference between Cc and Bcc is that carbon copy (CC) recipients are visible to all other recipients whereas those who are BCCed are not visible to anyone.

To specify the recipients, an e-mail message can contain addresses in any of the 3 following fields:

It is common practice to use the BCC: field when addressing a very long list of recipients, or a list of recipients that should not (necessarily) know each other, e.g. in mailing lists.

Comparison chart

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Bcc

Cc

Sight -Receiver cannot see Bcc -Receiver can see Cc
Replying -Bcc's cannot see the receiver's reply -Cc's cannot see the receiver's reply

edit Example of CC vs BCC

From: Frank Sinatra
To: Kurt Cobain
Cc: Bob Dylan; Jim Morrison
Bcc: Mark Knopfler; Paul McCartney

In the above example, all recipients of the email (including Mark Knopfler and Paul McCartney) will see the following email header information when they receive the email:

From: Frank Sinatra
To: Kurt Cobain
Cc: Bob Dylan; Jim Morrison

This means that none of the recipients will know who the Bcc recipients are. Each of the BCCed recipients will, of course, realize that they were on BCC but they will not know who else was on BCC.

edit Using Bcc to Preserve Privacy

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"Bcc vs Cc." Diffen.com. Diffen LLC, n.d. Web. 29 Jun 2015. < >