The name of this type of chart came from its shape within different axes emerging radially from one central point and - typically - are equally distributed.

The usage of radar chart 

• Analysis

It displays how the value of a given concept is changed over different parameters. 

• Decision-making

Mainly thanks to aggregating multiple data in one space, making data-based decisions can be more accessible.

The radar chart issue

Despite their advantages, there are some major flaws with this type of charts.

• First, multiple polygons in one chart can make it unreadable, especially if the polygons are filled in - the top polygon covers all the ones underneath it.

• Second, too many variables equal too many axes which also leads to confusing clutter.  

• Third, radar charts are not the best choice when comparing values across each variable.