FreeCAD is a parametric CAD program. A Sketch is a type of thing within FreeCAD. Sketches are defined using constraints and dimensions, not free-hand drawing.

FreeCAD is a parametric CAD program. A Sketch is a type of thing within FreeCAD. Sketches are defined using constraints and dimensions, not free-hand drawing. Blender is polygon-based 3D modelling with (pretty much) free-hand drawing and no constraints or dimensions. FreeCAD and Blender can both export to many of the same formats (notably STL, for 3d printing), but their internal data representation, and supported workflow, is completely different. FreeCAD is more appropriate when you want mechanical parts, and Blender is more appropriate when you want something artistic like a figurine.