"Forward" sends the message to another person or group, and will include any attachments included in the original email. This means that the person/group to whom the mail has been forwarded can see all details about the original sending.

What does forwarding allow you to do?

Forwarding an email allows a new recipient to see the email sent if they weren't originally included in the email chain. Also, forwarding an email message means that you send the message to another person or group, including all the content, text formatting, and attachments contained in the original email message.

Should I CC or forward?

To reply to the original sender and all other recipients on the To and Cc lines, select Reply All. To send the message to someone not on the To or Cc lines, select Forward.