Cc means on mail

I think I know what you might be referring to!

"CC" is an abbreviation that stands for "Carbon Copy". In the past, when documents were printed on paper, a carbon copy was a duplicate copy of a document that was made by placing a sheet of carbon paper between two sheets of paper. This allowed multiple copies of a document to be created quickly and easily.

In the context of email, "CC" is often used as an abbreviation for "Carbon Copy", but it's more commonly referred to as "CC" or "Carbon Copy" in email headers. When you CC someone on an email, you are sending them a copy of the email, but they are not the primary recipient. The primary recipient is usually the person or group of people who are being addressed in the email.

For example, if you send an email to John and CC Jane, John is the primary recipient, and Jane is receiving a copy of the email.