BCC - Blind Carbon Copy
Blind Carbon Copy, abbreviated as Bcc, a type of field that you may find while composing an email. It is used to mention the list of mail addresses where you want to send the copy of mail. But, the recipients would not get any details of other mail addresses mentioned in the list.
Difference between BCC and CC
The list of email addresses mentioned in the CC field appear to all the recipients .So, if you don't want your recipients to know the details of other recipient's mail address, mention them in Bcc block. The recipients mentioned in Bcc block will receive the carbon copy of the mail, but the details of other recipients are not visible to them.