What function does the subject line serve in correspondence?

The subject line in correspondence plays a crucial role in summarizing the main point of the document. Its primary purpose is to give the recipient a clear and concise understanding of the content at a glance. This allows the recipient to quickly assess the relevance and importance of the correspondence before engaging with the full document. A well-crafted subject line enhances clarity and sets the tone for the communication, ensuring that the key message is communicated effectively. By summarizing the main point, it helps prioritize the correspondence in the recipient's workload, facilitating efficient processing and response.