By utilizing the provided "lightning link," users can access a functionality represented by a bell icon which allows them to "watch" a particular tag. This feature is especially beneficial for users who wish to stay informed about new posts associated with that tag via email notifications. The implementation of this feature serves as an effective method to follow a topic through emails and keep abreast of the latest discussions and updates on the platform.

The emphasis here is on the convenience and practicality of the watch feature in keeping users engaged with the subjects they are most interested in without having to manually check the forum for updates. This tool is part of Discourse's commitment to enhancing user experience by providing tailored notification options that align with individual preferences for content consumption and participation in online discourse.