This document provides an overview of the fundamentals of line in art. It defines key line terminology like contour, cross-contour, hatching, and calligraphic line. It examines the physical characteristics of line including measure, type, direction, location, and character. It explores the expressive properties of line and how line relates to other elements like shape, value, texture and color. It discusses the spatial characteristics of line and how it can be used for representation on both abstract and realistic levels.