CC stands for "carbon copy" and is used to send a copy of an email to multiple recipients. BCC stands for "blind carbon copy" and is used to send a copy of an email to multiple recipients without revealing the email addresses of the recipients to each other.
CC is used when the recipients of the email should all be aware of who else is receiving the email. BCC is used when the recipients should not be aware of who else is receiving the email.
When using CC, the email addresses of all recipients are visible to each other. When using BCC, the email addresses of the recipients are hidden from each other.
CC is useful for sending a message to a group of people and letting them all know who else received the message. BCC is useful for sending a message to a group of people without revealing their email addresses to each other.
CC is also useful for keeping a record of who received the message. BCC is useful for keeping the email addresses of the recipients confidential.
In summary, CC is used when the recipients of the email should all be aware of who else is receiving the email, while BCC is used when the recipients should not be aware of who else is receiving the email.