What are calculated tables in Power BI used for?

Calculated tables in Power BI are specifically utilized to create new tables from DAX expressions. This functionality allows users to define tables based on existing data models or perform complex calculations that result in new aggregated datasets. These tables can be generated dynamically, aiding in scenarios where calculated columns or measures may not suffice for the desired analytics or reporting needs.

By using DAX expressions, users can manipulate relationships, perform data transformations, and establish a more robust data model, enabling enhanced data analysis capabilities. This flexibility can be crucial in scenarios where specific analytical requirements dictate the need for custom data structures that are not directly available in the existing data sources.

The other choices focus on various aspects of Power BI but don't accurately encompass the primary function of calculated tables. While they all relate to data management or reporting, they don't directly relate to the specific creation and functionality that calculated tables provide through DAX expressions.