From what I can recall, below is the function of Cc &
Bcc
If u send an email to another person in the Bcc field besides the
recipents in To & Cc fields, the recipents in To & Cc
fields won't know whoelse u send the email to in the Bcc field as
the name will not be shown in the email.
Another thing to note, if there r 2 recipents(Eg. John & Peter)
in the Bcc field, John won't know that Peter receive the email also
& vice versa