What is the purpose of the "subject" in a message body?

The purpose of the "subject" in a message body is to indicate what the message is about. It serves as a brief overview or title that summarizes the main topic or theme of the communication. This helps the recipient quickly assess the relevance of the message and decide when to read it. A clear and concise subject line can greatly improve the efficiency of communication, ensuring that the intended message is not overlooked or misunderstood.

While summarizing the message and providing context about attachments are important aspects of effective communication, the specific role of the subject line is to convey the essence of the content at a glance, making it easier for recipients to organize their emails and prioritize their responses. The formal address of the recipient is also crucial but pertains to the etiquette of the message rather than the content focus indicated by the subject.