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The tag is a bit of metadata added to a subscriber’s profile to track their activity or preferences. Tags can be used to keep track of purchases, what a subscriber is interested in (e.g. design vs. marketing), how engaged they are (clicked a link in a launch sequence) and where they were imported from. A subscriber can have an unlimited number of tags.
Finally, you can optionally include “automations” with your broadcast. Automations are a simple way to automatically add or remove tags when your subscribers do certain actions, like open the email or click on specific links. Adding and removing tags are important when creating segments, or subscriber groups, and triggering automated email campaigns.