The action of marking an electronic message in an email client serves as a visual reminder to revisit it later. This function allows users to prioritize certain communications amidst a high volume of correspondence. For example, a user might mark a message requiring a detailed response, indicating its need for further attention.
This feature enhances organizational capabilities and workflow management by enabling users to categorize and track messages requiring follow-up. Historically, physical flags were used to mark important documents; the electronic equivalent provides a similar function within a digital environment, contributing to increased efficiency and preventing overlooked tasks.