What is a curve polygon?

Excuse me, could you please elaborate on what exactly is meant by the term "curve polygon"? I'm familiar with polygons being geometric shapes made up of straight lines connecting multiple points, but the inclusion of the word "curve" is intriguing. Are we referring to a Polygon where the lines connecting the points are not strictly straight, but curved in some way? If so, what defines the nature of these curves and how do they differ from traditional polygons? Additionally, are there any specific mathematical properties or applications associated with curve polygons that distinguish them from their straight-lined counterparts?