This document discusses posters, including their purposes, features of good posters, rules for preparing posters, and advantages and disadvantages. A poster is a printed paper designed to be attached to a wall that typically includes both text and graphics to be both eye-catching and informative. Good posters are brief, simple, based on a single concept, have an attractive layout, and use suitable colors. Posters can be used to motivate learning, convey information quickly, create aesthetic effects, and serve as instructional aids.