The document discusses the effective use of posters. It notes that posters should stop, read, and remember people. A good poster is self-explanatory and captures attention in order to influence many people. When creating a poster, one should consider the audience, message, brevity, readability, use of images, and essential details. Posters should be attention-grabbing, have brief and clear information, be neat, use relevant visuals, and include important details like date and location. Color, letters, spelling, and simplicity are also important design considerations.