Tags are used to create additional, easily referenced groups of Locations, Gateways, Devices, and Smart Objects. A tag itself is a just a text string that can be used to filter objects when querying through APIs or when creating calculated values or event triggers.
As an example, tags can be used to filter Devices, so that a Rule can be applied to all Devices that have a given Tag.
Example of tags: Floor 5, Visitor Area, Phone Booth, Apartment.
Navigation: Settings -> Tags
The Tags page has a list of all Tags in the Device Network.
Navigation: Settings -> Tags -> +Create or click a Tag