What does CC stands for and means when sending emails?

It refers to the e-mail addresses of people who were forwarded copies of the same message.

The term CC originates from the Word a "carbon copy" which is the under-copy of a document created when a carbon paper is placed between original document and a paper on which a copy is intended. So by writing you get a copy of the original document.

In case of email - email-ids in CC list will get exact copy of the email which the email-id in to list will get.