Saved queries are business entities that define the parameters and criteria of a Common Data Service environment search. Saved queries support cross-entity searches. There are two entities available for queries against the Common Data Service environment.
A user query, called a saved view in the application, is owned by an individual user, can be assigned and shared with other users, and can be viewed by other users depending on the query's access privileges. This is appropriate for frequently used queries that span entity types and queries that perform aggregation. More information: UserQuery entity
A saved query, called a view in the application, is owned by an organization making it visible to all users in the organization. Saved queries (views) are used for both views defined for an entity and for filters and templates for Dynamics 365 for Outlook. More information: SavedQuery entity
A query in the form of a FetchXML statement is constructed and then assigned to the
UserQuery.FetchXml attribute. This query can be executed by using the ExecuteByIdUserQueryRequest message.
You can see the user query in the Advanced Find section of the model-driven app and also in the View drop-down list for an entity. You can export the value of the
UserQuery.FetchXml attribute by using the Download Fetch XML button in the Advanced Find dialog box.
Use Web API to execute saved queries
To know about executing user query and saved query using Web API, see Retrieve and execute predefined queries
Use Organization service to execute saved queries