Queries are used to perform a search for a specific piece of information, and the result of the query will return that piece of information to be stored in an attribute, or to be used by a rule action (such as set material or set property)
There are currently four different types of Queries available in the UI:
Node Queries- used to provide a list of nodes matching the search criteria for partial name or node-tags
Metadata Value Queries - used to fetch the value of a given metadata key, on either the parent Item or the items passed through an attribute, or on the current asset
Asset Queries - used to fetch the most recent asset matching the given metadata key-value pairs. They show up as Metadata Query in the platform UI.