Treemap is a space-efficient and more compact method for showing hierarchies
Treemap is a powerful and complex data analytics visualization method to display large hierarchical sets of data (nested rectangles) of varying colors and sizes. The larger the rectangle, the higher is the numerical value.
Originally created by Ben Shneiderman, Treemap became a solution for visualizing a vast file directory on a computer, saving lots of space on the screen. Taking this into account, Treemap is considered to be a space-efficient and more compact option for showing hierarchies. Also, Treemap is wonderful when it comes to comparing the proportions between categories by means of their area size.