"Curve through XYZ" and "convert entities"

Hi,

I'm a student and a new user of Solidworks, here is my question:

I'm importing a curve through XYZ points and then converting these points with "convert entities" for my sketch. I would like to know if, when I'm converting these points, the resulting curve is a spline or is made of several straight lines? I need that answer because I want to be pretty accurate and straight lines could not be sufficient.

Thanks in advance, best,

Bertrand

SolidworksSketching