This document provides an introduction to line sketching as part of a drafting lesson. It defines line sketching as drawing without drafting instruments using soft pencils and paper. The key aspects covered are that lines have length and direction, represent the edges of objects, and come in different weights and thicknesses. Specifically, it discusses three types of lines used in sketching: gestural lines that communicate feeling, contour lines that define form, and construction lines that use heavier lines to further define shapes.