What type of analysis can you perform using "Drill Down" functionality in Power BI?

The "Drill Down" functionality in Power BI specifically supports hierarchical analysis by allowing users to navigate through different levels of data granularity within a hierarchy. For example, if you have a hierarchy that includes categories like Year, Quarter, Month, and Day, using drill down enables you to start with a high-level overview (like total sales for the year) and then dive deeper into the data to view sales over individual months or days. This ability to step through various levels of detail is central to understanding how different dimensions of data relate to one another, which is the essence of hierarchical analysis.

Other analysis types are not typically supported in the same way by the drill down feature. Summary analysis focuses on aggregating data rather than exploring deeper, real-time analysis deals with processing data on the fly, and predictive analysis is about forecasting future trends based on existing data—all of which do not utilize the mechanism of navigating through hierarchical data in the same manner that drill down does. Thus, the functionality is inherently designed for hierarchical analysis, making it the correct answer in this context.