Sketching is the process of creating a two dimensional line drawing of some features of the object to be rendered. They are used to assist the 3D Tools in the formation of the part model.
Before a Sketch can be created, a plane must be selected. Planes can be picked from one of the Cartesian planes (XY, XZ, or YZ planes), from a predefined user plane, or from an existing flat surface on the part model.
Sketch Tools are used to render image parameters.
Inventor's Sketch Toolbar