It's a bit comical that after high school, we "know" calculus and understand American history well. Yet, we need to learn how to do taxes, vote, or what the CC and BCC stand for in an inbox.

These three fields are the ultimate trial and error. It's time we use them properly.

​To:

It means exactly what you think. Use this line for whom you’re addressing.

​CC:

If you’re not addressing someone, but you think they should be aware of the conversation, use the CC or “carbon copy”.

​BCC:

The “blind carbon copy” is a little trickier. It sends them the conversation without notifying the other recipients.
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The person BCC’d won’t receive any of the replies.

It’s most commonly used to remove an individual from a conversation or send a message to multiple people without letting them see who else it was sent to (updates).
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If you use it, let the BCC’d party know so they don’t reply to everyone. Most people don’t check how they’re addressed (but they should)