Final answer:
The Cc field is used to send a copy of an email message to additional recipients.
Step-by-step explanation:
The field used to send a copy of an email message is the Cc field, which stands for Carbon Copy. When you send an email and want to include additional recipients who should receive a copy of the message, you can enter their email addresses in the Cc field. This allows everyone listed in the Cc field to see who else received a copy of the email.
Learn more about Cc field in email message