Applicants can be tagged automatically based on the values that applicants select for certain fields on forms.
These are known as Tag Rules. To create or edit Tag Rules, navigate to Settings > Forms and click Tags.
Select a form to show all fields within the form. Select a field to display all values available for that field.
Click to type the tag that you would like to be assigned to any applicants that select that field value, and to choose the colour for that tag.