The phrase indicates the transmission of a message or document through electronic mail. For instance, a report might be submitted electronically as an attachment to an email, or a notification could be delivered directly within the body of an email message.
This method of communication provides advantages such as speed, efficiency, and global reach, facilitating rapid information exchange. Historically, it has evolved from simple text-based messaging to a sophisticated platform for multimedia communication, file sharing, and automated notifications, significantly impacting modern business practices and personal interactions.