The CC (carbon copy) field is an optional email field. It is used to send a copy of your email to any other mentioned email (or emails).
What is the difference between the To and CC fields, you ask? After all, you can enter multiple addresses
in both the To and CC fields. The difference is only in semantics. The
To field contains the emails of those
to whom this email is directly addressed. While recipients whose emails are contained in the
receive this email more for notification/review purposes, it may not apply to them at all.
Composebutton in the Gmail interface.
Bcc. Click on the
Bccfields, you can write several emails divided with space or a comma.