MailChimp Tags are labels you create to help organize your contacts. Tagging lets you bring your own contact structure into Mailchimp and label contacts based on data only you know about them.
Think of tags as labels for your contacts that help you stay organized. If you’ve ever worked with a customer relationship manager (CRM) or even a blogging platform before, you might have used a tagging feature to categorize people or content. In Mailchimp, tags are a way for you to label, or categorize, contacts based on information only you have about them.
If you would like more information on how tags work in MailChimp, take a look at MailChimp’s tag documentation.