Sketch

Introduction
In FreeCAD the word "Sketch" is normally used to refer to a Sketcher SketchObject ( class) that is defined by the Sketcher Workbench. This is a 2D drawing that uses mathematical constraints to describe 2D geometry precisely.

See Sketcher SketchObject for more information about this type of object.

Usage
There are two common ways to create a Sketch: using the Sketcher Workbench directly, or through the PartDesign Workbench.

Sketcher Workbench

 * 1) Switch to the Sketcher Workbench.
 * 2) Press.

PartDesign Workbench

 * 1) Switch to the PartDesign Workbench.
 * 2) Press.
 * 3) Press.

After you finish editing the sketch, close it to go out of edit mode. Double click on it to enter edit mode again.