What does the term 'Carbon Copy' refer to in communication?

The term 'Carbon Copy' in communication refers to a copy of a message that is sent to additional recipients beyond the primary recipient. This term originated from the use of carbon paper in traditional typewriting, where a layer of carbon paper would allow for multiple copies of a document to be created simultaneously as it was typed. In the context of modern digital communication, particularly email, including someone in the 'CC' field means they will receive a copy of the email, allowing them to be privy to the information without being the main recipient. This practice is useful for keeping relevant parties informed and maintaining transparency in communications.

The other options discuss different aspects of communication but do not accurately define 'Carbon Copy.' The use of digital tools pertains more to broader communication platforms but doesn't specifically capture the essence of carbon copying. Storing and filing documents deals with document management rather than the process of copying messages. Lastly, email encryption services focus on securing messages, which is unrelated to the concept of sharing information with multiple recipients.