Title: Blind carbon copy
Content:  The interpretation of "Bcc:" as "blind courtesy copy" is a backronym and not the original meaning; the historic  has an explicit "blind carbon" annotation in its definition of the Bcc: header field syntax. "Cc:" and "Bcc:" mean "carbon copy" and "blind carbon copy" respectively.
Title: Blind carbon copy
Content: Bcc is often used to prevent an accidental "Reply All" from sending a reply intended for only the originator of the message to the entire recipient list. ; To send a copy of one's correspondence to a third party (for example, a colleague) when one does not want to let the recipient know that this is being done (or when one does not want the recipient to know the third party's e-mail address, assuming the other recipient is in the To: or Cc: fields). ; To send a message to multiple parties with none of them knowing the other recipients. This can be accomplished by addressing a message to oneself (or, in some email clients, leaving the To: field empty) and filling in the 
Title: Blind carbon copy
Content:  intended recipients in the Bcc: field. ; To tighten the focus of an existing email correspondence. By "moving people to BCC," a sender can remove non-essential parties from the recipient list so that future reply-all's will not include them. It is customary to include a parenthetical note indicating that certain recipients have been moved to BCC. This can be done out of courtesy to uninterested parties, or as a way of politely cutting off non-essential parties from the thread going forward. ; To prevent the spread of computer viruses, spam, and malware by avoiding the accumulation of block-list e-mail addresses available to all Bcc: recipients, which often occurs in the form of chain letters. There are a number of reasons for using this feature:
Title: Blind carbon copy
Content:  allows the sender of a message to conceal the person entered in the Bcc field from the other recipients. This concept originally applied to paper correspondence and now also applies to email. In some circumstances, the typist creating a paper correspondence must ensure that multiple recipients of such a document do not see the names of other recipients. To achieve this, the typist can: With email, recipients of a message are specified using addresses in any of these three fields: It is common practice to use the Bcc: field when addressing a very long list of recipients, or a list of recipients who should not (necessarily) know each other, e.g. in mailing lists.
Title: Email
Content:  Carbon copy; Many email clients mark email in one's inbox differently depending on whether they are in the To: or Cc: list. ; Bcc: Blind carbon copy; addresses are usually only specified during SMTP delivery, and not usually listed in the message header. ; Content-Type: Information about how the message is to be displayed, usually a MIME type. ; Precedence: commonly with values "bulk", "junk", or "list"; used to indicate automated "vacation" or "out of office" responses should not be returned for this mail, e.g. to prevent vacation notices from sent to all other subscribers of a mailing list. Sendmail uses this field to affect prioritization of 
Title: Carbon copy
Content:  In common usage, an email message has three   fields for addressees:   the To field is for principal recipients of the message,  the Cc field indicates secondary recipients whose names are visible to one another and to the principal, and the Bcc (blind carbon copy) field contains the names of tertiary recipients whose names are invisible to each other and to the primary and secondary recipients. It is considered good practice to indicate to the other recipients that a new participant has been added to the list of receivers (e.g. by writing "I sent a copy to John Doe" or "John Doe, who is reading in copy, [...]").
Title: Blind carbon copy
Content: Add the names in a second step to each copy, without carbon paper; Copy Circulation ; Set the ribbon not to strike the paper, which leaves names off the top copy (but may leave letter impressions on the paper). To: Primary recipients ; Cc: Carbon copy to secondary recipients&mdash;other interested parties ; Bcc: Blind carbon copy to tertiary recipients who receive the message. The primary and secondary recipients cannot see the tertiary recipients. Depending on email software, the tertiary recipients may only see their own email address in Bcc, or they may see the email addresses of all primary and secondary recipients but will not see other tertiary recipients. Blind carbon copy (abbreviated 
Title: Block check character
Content:  In telecommunications, a block check character (BCC) is a character added to a transmission block to facilitate error detection. In longitudinal redundancy checking and cyclic redundancy checking, block check characters are computed for, and added to, each message block transmitted. This block check character is compared with a second block check character computed by the receiver to determine whether the transmission is error free.
Title: Boston Camera Club
Content:  BCC denotes Boston Camera Club:
Title: Carbon copy
Content:  Carbon copy can be used as a transitive verb with the meaning described under e-mail below related to the CC field of an e-mail message. That is, to send the message to additional recipients beyond the primary recipient. It is common practice to abbreviate the verb form, and many forms are used, including cc and cc:. Past tense forms in use are CCed, cc'd, cc'ed, cc-ed and cc:'d. Present participle or imperfect forms in use include cc'ing. Merriam-Webster uses cc, cc'd and cc'ing, respectively.

Question: what is the meaning of cc and bcc?
Answer: Carbon copy.
Carbon copy to secondary recipients.
Blind carbon copy.