This document defines and discusses different types of lines and how they are used in art. It begins by defining what a line is and describing characteristics like width, direction, and length. It then discusses different kinds of lines including horizontal, vertical, diagonal, straight, and curved lines. It explains how each line type can convey different meanings and effects, such as horizontal lines suggesting rest and vertical lines communicating height. Examples are given of specific artworks and how the lines are used within them. The document also covers techniques for creating value and texture using lines, such as hatching, crosshatching, stippling, and scribbling. It provides examples and instructions for an assignment involving these line techniques.