The phrasing describes the state of being included in an email communication thread. It indicates that an individual has been added to the recipients list, ensuring they receive subsequent messages related to the ongoing conversation. For example, a project manager might ensure a new team member is notified of all previous relevant discussions.
This practice facilitates transparency and collaboration within teams and organizations. By keeping individuals informed, it minimizes the potential for miscommunication, reduces the need for redundant information requests, and fosters a sense of shared awareness. This method of communication has evolved alongside the proliferation of email as a primary tool for workplace interaction.