The video tutorial explains the concept of drillthrough in Power BI, a feature that allows users to navigate between different pages or sheets within a report. It covers the creation of sheets P4, P5, and P6, each containing various charts and tables. The tutorial demonstrates how to implement drillthrough by adding fields and provides practical examples of using this feature with categories and regions. A real-world use case is discussed, illustrating how drillthrough can be used to create a hierarchical navigation structure in reports.

What new insight or understanding did you gain from this video?