Summary  
This chapter explains how to define and traverse multi-level data hierarchies in visuals—covering built-in and custom hierarchy creation and the drilldown, drillup, and expand operations for dynamic data exploration.

General domain of usage  
Interactive data visualization

Explore the powerful **drill up**, **drill down**, and **expand** features in Power BI to make your reports more interactive and insightful. Learn how to set up **hierarchies** that let you seamlessly move between detailed data views and summarized overviews. These tools enable you to analyze trends at different levels of granularity — from broad summaries to specific details — enhancing both your data exploration and storytelling capabilities in Power BI.

Which feature allows users to navigate from a summary level of data to a more detailed view?

Drilldown and Hierarchies