When you send an email, you need to select the address that will receive it (that is what ‘recipient’ means). You can add them to one of three fields: To, Cc and Bcc. All three fields can send an email to several recipients in one go, however, they work slightly differently.
To: The "To" line is for the primary recipient. Put the whatsapp data email address here if the message is for this recipient’s action and attention only. This line is visible to all other recipients (Cc, and Bcc) by default.
CC: Stands for Carbon copy. Put email address(es) here if you plan to send a copy to other recipients in addition to those listed in the ‘To’ field. This is used if you don’t mind that recipients seeing who else is getting a copy, because the list of recipients is included in the header message.