This document discusses audio-visual aids and their use in education. It defines audio-visual aids as multisensory materials that help clarify learning and stimulate students. The document outlines several key characteristics of effective audio-visual aids, including that they should be meaningful, motivate students, be accurate and up to date. It then describes the main types of visual aids, including projected aids like overhead projectors and PowerPoint, as well as non-projected aids such as charts, flashcards, posters, cartoons and models. Specific details are provided about the purpose and use of different chart types, flashcards, posters and presentation software guidelines.