Is every polygon a curve?

Is it truly accurate to assert that every polygon, with its distinct, straight-edged boundaries, can be classified as a curve? Isn't a Polygon fundamentally defined by its straight lines and angles, which are inherently different from the smooth, flowing nature of a curve? Are there any mathematical or geometrical principles that might suggest a polygon can, in some sense, be considered a curve, or is this a misconception that needs to be clarified?