A tag is meta data attached to any project haystack entity type. Typical users can think of an entity as a point. But entity also includes things like Floors, Zones, and Equips.
Marker tag - A tag that is a searchable string associated with an entity.
Key Value pair - Here there is a string that is the Key tag which has an associated value or set of values.
e.g. 'manufacturer' = 'daikin'
These tags are used by the standard haystack filters and queries for analytics, and internally to 75F for control.
Learn more about how to use tags for querying with the article below.