Name a key feature of email etiquette.

Using a clear and relevant subject line is essential in email etiquette because it provides the recipient with immediate context about the content of the email. A well-crafted subject line allows the reader to understand what the email pertains to before even opening it, helping them prioritize their responses effectively. It can also assist in organizing emails and making them easier to search for later. This practice promotes efficient communication, minimizing misunderstandings and improving the overall exchange of information.

In contrast, replying to all emails immediately can lead to excessive clutter and may not always be necessary; informal language might diminish professionalism in communication, particularly in a business setting; and utilizing long paragraphs can overwhelm readers and obscure the main points you want to convey. Therefore, a clear and relevant subject line stands out as a fundamental aspect of professional email correspondence.