Carbon copy is a way to send someone a copy of an email without making them a direct recipient

When you put someone's address in the CC field of an email, they receive the same message as the person in the "To" field — but the email makes it clear they are receiving a copy, not the primary recipient. Everyone on the email (in the To, CC, and BCC fields) can see who is in the To and CC fields. The CC recipient knows they are not the main person the sender is writing to.

The term comes from the old office practice of using carbon paper to make duplicate copies of letters. When you typed a letter with carbon paper underneath, you created a second copy at the same time. The person who received the carbon copy got the same information as the original recipient, but everyone knew it was a duplicate made for reference or record-keeping.

Email works the same way conceptually, even though no paper is involved. You use CC when you want someone to see what you wrote and what was said, but they are not the person you are primarily addressing.

Key Takeaways

  • CC stands for carbon copy and sends a message to an additional person while making it clear they are not the primary recipient.
  • Everyone on the email can see who is in the To and CC fields, so use CC only when you want transparency about who else received the message.
  • BCC (blind carbon copy) sends a copy to someone without showing their address to other recipients — use this when you need to keep someone's involvement private.
  • Use CC to keep someone informed or to create a record that they saw the message, but not when you need a response from them.

When to use CC instead of the To field

Use CC when you want someone to be aware of a conversation but they are not the person you are asking to take action. For example, if you email your manager about a project delay, you might CC your team lead so they know about the issue without being the one you are directly reporting to.

CC is also useful for creating a paper trail. If you CC someone, there is a record that they received the message and saw what was discussed. This matters in work situations where you want documentation that information was shared.

Do not use CC as a way to avoid directly addressing someone. If you need a response from a person, put them in the To field. If you put them in CC, you are signaling that you do not expect them to be the one who acts on the message.

The difference between CC and BCC

BCC stands for blind carbon copy. When you put someone in the BCC field, they receive the email, but their address is hidden from everyone else on the message. The To and CC recipients cannot see that the BCC person received it.

Use BCC when you need to send information to someone but you do not want other recipients to know they are involved. For example, if you are sending an update to a large group of people and you also want to BCC your own email address so you have a copy in your sent folder, the group will not see that you BCC'd yourself.

BCC is also appropriate when you are sending the same message to many people who do not know each other and should not see each other's email addresses. Some people use BCC for this reason instead of putting dozens of addresses in the To field.

Why the term still exists even though carbon paper is gone

Email systems kept the CC and BCC labels because the concept was already familiar to office workers when email became standard in the 1990s. People understood what carbon copy meant from their experience with typewriters and photocopiers, so email designers used the same terminology to explain how to send copies of messages.

The term stuck even as the technology changed. Today, almost no one uses actual carbon paper, but CC and BCC remain the standard way to describe these email functions. Changing the labels now would confuse people who have used email for decades and would not add any real benefit.

Common mistakes people make with CC

One frequent mistake is using CC when you should use To. If you need someone to respond or take action, put them in the To field. Putting them in CC signals that you are just keeping them informed, which can lead to confusion about who is responsible for responding.

Another mistake is CC'ing too many people. If you CC someone, they receive the email and may feel obligated to read it and stay informed. CC'ing an entire department on a message meant for one person creates unnecessary email clutter for everyone else.

People also sometimes forget that CC is transparent. Everyone can see who else received the message. If you CC someone, the primary recipient knows about it. If you want to keep someone's involvement private, use BCC instead — but be thoughtful about whether that is appropriate in your situation.

CC in different email programs

Most email programs — Gmail, Outlook, Apple Mail, and others — use the same CC and BCC fields in the same way. When you compose a message, you will see a line for To, and you can usually click "CC" or "Add CC" to reveal the CC field. BCC is often hidden by default; you may need to click a link that says "BCC" or "Show BCC" to see it.

Mobile email apps sometimes hide CC and BCC behind a menu or a "+" button because phone screens have less space. The function works the same way, but you may need to look for an option to add recipients beyond the main To field.

Frequently Asked Questions

Can someone tell if I CC'd them instead of putting them in the To field?

Yes. Everyone on the email can see who is in the To field and who is in the CC field. If you CC someone, the primary recipient will see that person's address listed under CC. There is no way to hide that someone was CC'd.

What happens if I reply to an email I was CC'd on?

When you click Reply on an email you were CC'd on, the reply usually goes only to the sender and anyone in the To field — not to all the CC recipients. If you want your reply to reach everyone who saw the original message, you need to click Reply All instead.

Is it rude to CC someone without asking them first?

In most work situations, no. CC'ing someone is a normal way to keep them informed. However, if you are CC'ing someone on a personal or sensitive conversation, it is considerate to mention it first or ask if they want to be included.

Should I use CC or BCC when sending to a mailing list?

If you are sending to a mailing list that is set up as a group, you put the list address in the To field — the email program handles the copying automatically. If you are manually sending the same message to many individual people who should not see each other's addresses, use BCC.