Saba Shahzadi discusses the importance and types of visual aids that can be used in presentations. Visual aids help illustrate complex concepts, reinforce ideas, enliven difficult subjects, and help audiences follow along. There are several types of visual aids including slides, photographs, diagrams, objects, whiteboards, and videos. Each type has advantages such as adding sensory dimensions or being interactive, but also disadvantages like technical problems or distracting from the presenter. Overall, visual aids are important presentation tools to improve audience comprehension when used appropriately.