IQD stands for Impromptu query definition,

• It is a report save extension with .iqd it is used for creating a cube in the powerplay transformer.
• It contains the SQL query to display the data from the database and the SQL query is automatically created based on the columns selected from the database.
• It contains a multidimensional data structure with an array format for creating cubes. These reports can be saved.IQD files.