Meaning Carbon copy
Type Acronym
Popularity ★ ★ ★ ★ ★  Popular
Usage Online Only (chat, messaging, e-mail)

CC means carbon copy. It is an email field that allows the sender to copy a message to one or more other addresses besides the main recipient.

While CC is commonly used as a noun it can also be used as a verb, i.e. "CC the rest of the group in your e-mail as well." It appears above the "BCC" field and below the "To" field at the top of an email.

Updated July 19, 2016
Meaning I understand
Type Acronym
Popularity ★ ☆ ☆ ☆ ☆  Rare
Usage Online Only (chat, messaging, e-mail)

Means "I copy," which is another way of saying, "I understand."

Example "CC - I will be at your house no later than 6:00 PM tomorrow."
Updated October 4, 2021
Information from PC.net