The Tags feature provides an overview of the tags added to survey responses by your users. 

You will find it in Settings → System Admin → Data Administration → Tags, available for all Global Admins

The Tags shows a list of the tags with a count of responses that the tag has been used.

You can add, edit or delete tags. Simply click on the 3 dots in the right as indicated in the screenshot below.

Please note: when a tag is deleted it's PERMANENTLY deleted, and all it's occurrences will be removed from the survey responses