About Profile Tags
Tags are internal markers that can be manually applied to Profiles. They can be created from your account settings.
To read more about how to create Tags from your account settings, go to this article. Only Account Owners and Admin Users may access the account settings. Read more about APSIS One's User Roles and Permissions here.
These are the main differences between Attributes and Tags:
Tags, themselves, do not contain data. Attributes can be understood as being something like "type of data = data" (gender = female) while Tags are more like "Label = yes / no" (either Tag is applied or it isn't).
Profile Tags are applied manually. Attributes, on the contrary, gather the data automatically and feed it into the Profile. In order for a Profile to have a Tag, a user must apply the Tag. Alternatively, if a file containing Profile data is uploaded, they can be Tagged in advance.
Tags are internal and the relevance of a Tag depends on its creator. Attributes reflect the reality of the data in the Profiles, while Tags don't have to. For example, if a user imports Profiles with the File Import Wizard and Tags them as "Special Import 19", then it will be possible to filter the recipients of an email send-out to make sure only those Profiles Tagged receive the email.