Summary  
This chapter covers how to implement a treemap visualization by mapping hierarchical data to nested rectangles, using rectangle size to represent one metric and color to encode another.  

General domain of usage  
Data visualization for business intelligence and analytics dashboards.

## Why Treemaps?  

Treemaps are particularly useful when:  
- Visualizing large datasets with hierarchical structures;  
- Quickly identifying the most profitable categories or areas with significant sales;  
- Spotting patterns and outliers within a category or subcategory.  

What does the size of rectangles in a treemap represent?

You will master essential Tableau skills needed for business intelligence: connecting data sources, working with dimensions and measures, creating interactive visualizations, designing dashboards, and sharing insights. Each chapter includes practical tasks and projects for hands-on learning.