Treemapping is a data visualization technique that is used to display hierarchical data using nested rectangles; the treemap chart is created based on this technique of data visualization.

What is a treemap chart used for?

The treemap was originally designed to visualize a very large amount of data in a hierarchical, tree-structured diagram where the size of the rectangles organized from largest to smallest. Color is used to encode a second dimension. Today, they're often used generally for categorical data.

What is sunburst chart?

A sunburst chart is useful for visualizing hierarchical data structures. A sunburst chart consists of an inner circle surrounded by rings of deeper hierarchy levels. The angle of each segment proportional to either a value or divided equally under its inner segment.