This document discusses the classification and purpose of using visual aids in presentations. It notes that visual aids can increase understanding, explain points, make an impact, and engage audiences. The document outlines different types of visual aids like graphs, photos, and video clips. It also discusses how to properly prepare and use visual aids by making them clear, concise, high-quality, and consistent with the presenter's message. Color choices and only using visual aids to emphasize key points are also addressed.