Which aspect of a tree map allows users to explore hierarchical relationships in data?

The defined group by dimensions is key to allowing users to explore hierarchical relationships in data within a treemap. In a treemap, data is represented hierarchically with parent-child relationships, where each rectangle displays a distinct part of the overall dataset. By grouping data according to defined dimensions, users can visually see how different categories relate to one another, with parent categories encompassing children beneath them.

This hierarchical representation provides clarity on how specific segments contribute to larger groups, facilitating exploration and understanding of complex datasets. Users can easily navigate through this visual structure, making it intuitive to analyze and glean insights from the data.