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.

How to use
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.